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Simplifying 87 = 7(x + 4) Reorder the terms: 87 = 7(4 + x) 87 = (4 * 7 + x * 7) 87 = (28 + 7x) Solving 87 = 28 + 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. 87 + -7x = 28 + 7x + -7x Combine like terms: 7x + -7x = 0 87 + -7x = 28 + 0 87 + -7x = 28 Add '-87' to each side of the equation. 87 + -87 + -7x = 28 + -87 Combine like terms: 87 + -87 = 0 0 + -7x = 28 + -87 -7x = 28 + -87 Combine like terms: 28 + -87 = -59 -7x = -59 Divide each side by '-7'. x = 8.428571429 Simplifying x = 8.428571429
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