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Simplifying -5(7 + 3x) + -7 = -87 (7 * -5 + 3x * -5) + -7 = -87 (-35 + -15x) + -7 = -87 Reorder the terms: -35 + -7 + -15x = -87 Combine like terms: -35 + -7 = -42 -42 + -15x = -87 Solving -42 + -15x = -87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + -15x = -87 + 42 Combine like terms: -42 + 42 = 0 0 + -15x = -87 + 42 -15x = -87 + 42 Combine like terms: -87 + 42 = -45 -15x = -45 Divide each side by '-15'. x = 3 Simplifying x = 3
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