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Simplifying (3x + 7) = 7x + 15 Reorder the terms: (7 + 3x) = 7x + 15 Remove parenthesis around (7 + 3x) 7 + 3x = 7x + 15 Reorder the terms: 7 + 3x = 15 + 7x Solving 7 + 3x = 15 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 7 + 3x + -7x = 15 + 7x + -7x Combine like terms: 3x + -7x = -4x 7 + -4x = 15 + 7x + -7x Combine like terms: 7x + -7x = 0 7 + -4x = 15 + 0 7 + -4x = 15 Add '-7' to each side of the equation. 7 + -7 + -4x = 15 + -7 Combine like terms: 7 + -7 = 0 0 + -4x = 15 + -7 -4x = 15 + -7 Combine like terms: 15 + -7 = 8 -4x = 8 Divide each side by '-4'. x = -2 Simplifying x = -2
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