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Simplifying 315 = 7(15 + x) 315 = (15 * 7 + x * 7) 315 = (105 + 7x) Solving 315 = 105 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 315 + -7x = 105 + 7x + -7x Combine like terms: 7x + -7x = 0 315 + -7x = 105 + 0 315 + -7x = 105 Add '-315' to each side of the equation. 315 + -315 + -7x = 105 + -315 Combine like terms: 315 + -315 = 0 0 + -7x = 105 + -315 -7x = 105 + -315 Combine like terms: 105 + -315 = -210 -7x = -210 Divide each side by '-7'. x = 30 Simplifying x = 30
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