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Simplifying -4 + 7(x + 7) = 87 Reorder the terms: -4 + 7(7 + x) = 87 -4 + (7 * 7 + x * 7) = 87 -4 + (49 + 7x) = 87 Combine like terms: -4 + 49 = 45 45 + 7x = 87 Solving 45 + 7x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + 7x = 87 + -45 Combine like terms: 45 + -45 = 0 0 + 7x = 87 + -45 7x = 87 + -45 Combine like terms: 87 + -45 = 42 7x = 42 Divide each side by '7'. x = 6 Simplifying x = 6
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