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Simplifying 39 = -1(21 + -1x) + 3(x + -3) 39 = (21 * -1 + -1x * -1) + 3(x + -3) 39 = (-21 + 1x) + 3(x + -3) Reorder the terms: 39 = -21 + 1x + 3(-3 + x) 39 = -21 + 1x + (-3 * 3 + x * 3) 39 = -21 + 1x + (-9 + 3x) Reorder the terms: 39 = -21 + -9 + 1x + 3x Combine like terms: -21 + -9 = -30 39 = -30 + 1x + 3x Combine like terms: 1x + 3x = 4x 39 = -30 + 4x Solving 39 = -30 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 39 + -4x = -30 + 4x + -4x Combine like terms: 4x + -4x = 0 39 + -4x = -30 + 0 39 + -4x = -30 Add '-39' to each side of the equation. 39 + -39 + -4x = -30 + -39 Combine like terms: 39 + -39 = 0 0 + -4x = -30 + -39 -4x = -30 + -39 Combine like terms: -30 + -39 = -69 -4x = -69 Divide each side by '-4'. x = 17.25 Simplifying x = 17.25
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