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Simplifying 7x + -1(-3 + 3x) = 15 7x + (-3 * -1 + 3x * -1) = 15 7x + (3 + -3x) = 15 Reorder the terms: 3 + 7x + -3x = 15 Combine like terms: 7x + -3x = 4x 3 + 4x = 15 Solving 3 + 4x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4x = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 4x = 15 + -3 4x = 15 + -3 Combine like terms: 15 + -3 = 12 4x = 12 Divide each side by '4'. x = 3 Simplifying x = 3
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