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