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Simplifying 87 = 4x + -13 Reorder the terms: 87 = -13 + 4x Solving 87 = -13 + 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 = -13 + 4x + -4x Combine like terms: 4x + -4x = 0 87 + -4x = -13 + 0 87 + -4x = -13 Add '-87' to each side of the equation. 87 + -87 + -4x = -13 + -87 Combine like terms: 87 + -87 = 0 0 + -4x = -13 + -87 -4x = -13 + -87 Combine like terms: -13 + -87 = -100 -4x = -100 Divide each side by '-4'. x = 25 Simplifying x = 25
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