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Simplifying 3(x + -7) + -7x = 15 Reorder the terms: 3(-7 + x) + -7x = 15 (-7 * 3 + x * 3) + -7x = 15 (-21 + 3x) + -7x = 15 Combine like terms: 3x + -7x = -4x -21 + -4x = 15 Solving -21 + -4x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -4x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + -4x = 15 + 21 -4x = 15 + 21 Combine like terms: 15 + 21 = 36 -4x = 36 Divide each side by '-4'. x = -9 Simplifying x = -9
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