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Simplifying (7x + -15) = (4x + 15) Reorder the terms: (-15 + 7x) = (4x + 15) Remove parenthesis around (-15 + 7x) -15 + 7x = (4x + 15) Reorder the terms: -15 + 7x = (15 + 4x) Remove parenthesis around (15 + 4x) -15 + 7x = 15 + 4x Solving -15 + 7x = 15 + 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. -15 + 7x + -4x = 15 + 4x + -4x Combine like terms: 7x + -4x = 3x -15 + 3x = 15 + 4x + -4x Combine like terms: 4x + -4x = 0 -15 + 3x = 15 + 0 -15 + 3x = 15 Add '15' to each side of the equation. -15 + 15 + 3x = 15 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = 15 + 15 3x = 15 + 15 Combine like terms: 15 + 15 = 30 3x = 30 Divide each side by '3'. x = 10 Simplifying x = 10
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