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Simplifying 15 = -3(-7 + x) 15 = (-7 * -3 + x * -3) 15 = (21 + -3x) Solving 15 = 21 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 15 + 3x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 15 + 3x = 21 + 0 15 + 3x = 21 Add '-15' to each side of the equation. 15 + -15 + 3x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 3x = 21 + -15 3x = 21 + -15 Combine like terms: 21 + -15 = 6 3x = 6 Divide each side by '3'. x = 2 Simplifying x = 2
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