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Simplifying -15 + 7x = -2(-15 + x) -15 + 7x = (-15 * -2 + x * -2) -15 + 7x = (30 + -2x) Solving -15 + 7x = 30 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. -15 + 7x + 2x = 30 + -2x + 2x Combine like terms: 7x + 2x = 9x -15 + 9x = 30 + -2x + 2x Combine like terms: -2x + 2x = 0 -15 + 9x = 30 + 0 -15 + 9x = 30 Add '15' to each side of the equation. -15 + 15 + 9x = 30 + 15 Combine like terms: -15 + 15 = 0 0 + 9x = 30 + 15 9x = 30 + 15 Combine like terms: 30 + 15 = 45 9x = 45 Divide each side by '9'. x = 5 Simplifying x = 5
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