Retaining the Concepts. Solve and determine whether 8(x - 3) + 4 = 8x - 21 is an identity, a conditional equation, or an inconsistent equation.

In Exercises 71–78, solve each equation. Then determine whether the equation is an identity, a conditional equation, or an inconsistent equation.5x + 7 = 2x + 7

The equations in Exercises 79–90 combine the types of equations we have discussed in this section. Solve each equation. Then state whether the equation is an identity, a conditional equation, or an inconsistent equation.4/(x - 2) + 3/(x + 5) = 7/(x + 5)(x - 2)

The equations in Exercises 79–90 combine the types of equations we have discussed in this section. Solve each equation. Then state whether the equation is an identity, a conditional equation, or an inconsistent equation.4x/(x + 3) - 12/(x - 3) = (4x^2 + 36)/(x^2 - 9)

The equations in Exercises 79–90 combine the types of equations we have discussed in this section. Solve each equation. Then state whether the equation is an identity, a conditional equation, or an inconsistent equation.4/(x^2 + 3x - 10) - 1/(x^2 + x - 6) = 3/(x^2 - x - 12)

Evaluate x^2 - x for the value of x satisfying 4(x - 2) + 2 = 4x - 2(2 - x).

In Exercises 99–106, solve each equation.[(3 + 6)^2 ÷ 3] × 4 = - 54 x

In Exercises 99–106, solve each equation.5 - 12x = 8 - 7x - [6 ÷ 3(2 + 5^3) + 5x]

In Exercises 99–106, solve each equation.0.7x + 0.4(20) = 0.5(x + 20)