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Simplifying 129 = 2x + 5(2x) + -3 Remove parenthesis around (2x) 129 = 2x + 5 * 2x + -3 Multiply 5 * 2 129 = 2x + 10x + -3 Reorder the terms: 129 = -3 + 2x + 10x Combine like terms: 2x + 10x = 12x 129 = -3 + 12x Solving 129 = -3 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 129 + -12x = -3 + 12x + -12x Combine like terms: 12x + -12x = 0 129 + -12x = -3 + 0 129 + -12x = -3 Add '-129' to each side of the equation. 129 + -129 + -12x = -3 + -129 Combine like terms: 129 + -129 = 0 0 + -12x = -3 + -129 -12x = -3 + -129 Combine like terms: -3 + -129 = -132 -12x = -132 Divide each side by '-12'. x = 11 Simplifying x = 11
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