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Simplifying 7x + 15 + -3x = 87 Reorder the terms: 15 + 7x + -3x = 87 Combine like terms: 7x + -3x = 4x 15 + 4x = 87 Solving 15 + 4x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 4x = 87 + -15 Combine like terms: 15 + -15 = 0 0 + 4x = 87 + -15 4x = 87 + -15 Combine like terms: 87 + -15 = 72 4x = 72 Divide each side by '4'. x = 18 Simplifying x = 18
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