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Simplifying 87 = 3x + 7(3x + -15) Reorder the terms: 87 = 3x + 7(-15 + 3x) 87 = 3x + (-15 * 7 + 3x * 7) 87 = 3x + (-105 + 21x) Reorder the terms: 87 = -105 + 3x + 21x Combine like terms: 3x + 21x = 24x 87 = -105 + 24x Solving 87 = -105 + 24x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-24x' to each side of the equation. 87 + -24x = -105 + 24x + -24x Combine like terms: 24x + -24x = 0 87 + -24x = -105 + 0 87 + -24x = -105 Add '-87' to each side of the equation. 87 + -87 + -24x = -105 + -87 Combine like terms: 87 + -87 = 0 0 + -24x = -105 + -87 -24x = -105 + -87 Combine like terms: -105 + -87 = -192 -24x = -192 Divide each side by '-24'. x = 8 Simplifying x = 8
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