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Simplifying -7x + -15 = 2x + 21 Reorder the terms: -15 + -7x = 2x + 21 Reorder the terms: -15 + -7x = 21 + 2x Solving -15 + -7x = 21 + 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 = 21 + 2x + -2x Combine like terms: -7x + -2x = -9x -15 + -9x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 -15 + -9x = 21 + 0 -15 + -9x = 21 Add '15' to each side of the equation. -15 + 15 + -9x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -9x = 21 + 15 -9x = 21 + 15 Combine like terms: 21 + 15 = 36 -9x = 36 Divide each side by '-9'. x = -4 Simplifying x = -4
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