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Simplifying 3x + 15 = 7 + 4x Reorder the terms: 15 + 3x = 7 + 4x Solving 15 + 3x = 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 + 3x + -4x = 7 + 4x + -4x Combine like terms: 3x + -4x = -1x 15 + -1x = 7 + 4x + -4x Combine like terms: 4x + -4x = 0 15 + -1x = 7 + 0 15 + -1x = 7 Add '-15' to each side of the equation. 15 + -15 + -1x = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -1x = 7 + -15 -1x = 7 + -15 Combine like terms: 7 + -15 = -8 -1x = -8 Divide each side by '-1'. x = 8 Simplifying x = 8
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