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Simplifying 15 = 5x + -3(x + 7) Reorder the terms: 15 = 5x + -3(7 + x) 15 = 5x + (7 * -3 + x * -3) 15 = 5x + (-21 + -3x) Reorder the terms: 15 = -21 + 5x + -3x Combine like terms: 5x + -3x = 2x 15 = -21 + 2x Solving 15 = -21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 15 + -2x = -21 + 2x + -2x Combine like terms: 2x + -2x = 0 15 + -2x = -21 + 0 15 + -2x = -21 Add '-15' to each side of the equation. 15 + -15 + -2x = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -2x = -21 + -15 -2x = -21 + -15 Combine like terms: -21 + -15 = -36 -2x = -36 Divide each side by '-2'. x = 18 Simplifying x = 18
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