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Simplifying 15 = x + 3x + 7 Reorder the terms: 15 = 7 + x + 3x Combine like terms: x + 3x = 4x 15 = 7 + 4x Solving 15 = 7 + 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 + -4x = 7 + 4x + -4x Combine like terms: 4x + -4x = 0 15 + -4x = 7 + 0 15 + -4x = 7 Add '-15' to each side of the equation. 15 + -15 + -4x = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -4x = 7 + -15 -4x = 7 + -15 Combine like terms: 7 + -15 = -8 -4x = -8 Divide each side by '-4'. x = 2 Simplifying x = 2
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