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Simplifying -87 = -4x + -7 Reorder the terms: -87 = -7 + -4x Solving -87 = -7 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -87 + 4x = -7 + -4x + 4x Combine like terms: -4x + 4x = 0 -87 + 4x = -7 + 0 -87 + 4x = -7 Add '87' to each side of the equation. -87 + 87 + 4x = -7 + 87 Combine like terms: -87 + 87 = 0 0 + 4x = -7 + 87 4x = -7 + 87 Combine like terms: -7 + 87 = 80 4x = 80 Divide each side by '4'. x = 20 Simplifying x = 20
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