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Simplifying 13 = -3(21 + -1x) + 2(x + -2) 13 = (21 * -3 + -1x * -3) + 2(x + -2) 13 = (-63 + 3x) + 2(x + -2) Reorder the terms: 13 = -63 + 3x + 2(-2 + x) 13 = -63 + 3x + (-2 * 2 + x * 2) 13 = -63 + 3x + (-4 + 2x) Reorder the terms: 13 = -63 + -4 + 3x + 2x Combine like terms: -63 + -4 = -67 13 = -67 + 3x + 2x Combine like terms: 3x + 2x = 5x 13 = -67 + 5x Solving 13 = -67 + 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. 13 + -5x = -67 + 5x + -5x Combine like terms: 5x + -5x = 0 13 + -5x = -67 + 0 13 + -5x = -67 Add '-13' to each side of the equation. 13 + -13 + -5x = -67 + -13 Combine like terms: 13 + -13 = 0 0 + -5x = -67 + -13 -5x = -67 + -13 Combine like terms: -67 + -13 = -80 -5x = -80 Divide each side by '-5'. x = 16 Simplifying x = 16
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