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Simplifying (2x + -21) = (5x + -129) Reorder the terms: (-21 + 2x) = (5x + -129) Remove parenthesis around (-21 + 2x) -21 + 2x = (5x + -129) Reorder the terms: -21 + 2x = (-129 + 5x) Remove parenthesis around (-129 + 5x) -21 + 2x = -129 + 5x Solving -21 + 2x = -129 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -21 + 2x + -5x = -129 + 5x + -5x Combine like terms: 2x + -5x = -3x -21 + -3x = -129 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + -3x = -129 + 0 -21 + -3x = -129 Add '21' to each side of the equation. -21 + 21 + -3x = -129 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = -129 + 21 -3x = -129 + 21 Combine like terms: -129 + 21 = -108 -3x = -108 Divide each side by '-3'. x = 36 Simplifying x = 36
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