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Simplifying (x + 7) + x + 3x = 87 Reorder the terms: (7 + x) + x + 3x = 87 Remove parenthesis around (7 + x) 7 + x + x + 3x = 87 Combine like terms: x + x = 2x 7 + 2x + 3x = 87 Combine like terms: 2x + 3x = 5x 7 + 5x = 87 Solving 7 + 5x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 5x = 87 + -7 Combine like terms: 7 + -7 = 0 0 + 5x = 87 + -7 5x = 87 + -7 Combine like terms: 87 + -7 = 80 5x = 80 Divide each side by '5'. x = 16 Simplifying x = 16
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