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Simplifying x + 3x + (3x + 17) = 87 Reorder the terms: x + 3x + (17 + 3x) = 87 Remove parenthesis around (17 + 3x) x + 3x + 17 + 3x = 87 Reorder the terms: 17 + x + 3x + 3x = 87 Combine like terms: x + 3x = 4x 17 + 4x + 3x = 87 Combine like terms: 4x + 3x = 7x 17 + 7x = 87 Solving 17 + 7x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + 7x = 87 + -17 Combine like terms: 17 + -17 = 0 0 + 7x = 87 + -17 7x = 87 + -17 Combine like terms: 87 + -17 = 70 7x = 70 Divide each side by '7'. x = 10 Simplifying x = 10
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