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