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Simplifying 21(b + -1) + 9 = 3(7b + -4) Reorder the terms: 21(-1 + b) + 9 = 3(7b + -4) (-1 * 21 + b * 21) + 9 = 3(7b + -4) (-21 + 21b) + 9 = 3(7b + -4) Reorder the terms: -21 + 9 + 21b = 3(7b + -4) Combine like terms: -21 + 9 = -12 -12 + 21b = 3(7b + -4) Reorder the terms: -12 + 21b = 3(-4 + 7b) -12 + 21b = (-4 * 3 + 7b * 3) -12 + 21b = (-12 + 21b) Add '12' to each side of the equation. -12 + 12 + 21b = -12 + 12 + 21b Combine like terms: -12 + 12 = 0 0 + 21b = -12 + 12 + 21b 21b = -12 + 12 + 21b Combine like terms: -12 + 12 = 0 21b = 0 + 21b 21b = 21b Add '-21b' to each side of the equation. 21b + -21b = 21b + -21b Combine like terms: 21b + -21b = 0 0 = 21b + -21b Combine like terms: 21b + -21b = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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