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Simplifying x + (x + 30) = 3x + x Reorder the terms: x + (30 + x) = 3x + x Remove parenthesis around (30 + x) x + 30 + x = 3x + x Reorder the terms: 30 + x + x = 3x + x Combine like terms: x + x = 2x 30 + 2x = 3x + x Combine like terms: 3x + x = 4x 30 + 2x = 4x Solving 30 + 2x = 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. 30 + 2x + -4x = 4x + -4x Combine like terms: 2x + -4x = -2x 30 + -2x = 4x + -4x Combine like terms: 4x + -4x = 0 30 + -2x = 0 Add '-30' to each side of the equation. 30 + -30 + -2x = 0 + -30 Combine like terms: 30 + -30 = 0 0 + -2x = 0 + -30 -2x = 0 + -30 Combine like terms: 0 + -30 = -30 -2x = -30 Divide each side by '-2'. x = 15 Simplifying x = 15
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