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Simplifying 2(x + -7) = 9x + -21 Reorder the terms: 2(-7 + x) = 9x + -21 (-7 * 2 + x * 2) = 9x + -21 (-14 + 2x) = 9x + -21 Reorder the terms: -14 + 2x = -21 + 9x Solving -14 + 2x = -21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -14 + 2x + -9x = -21 + 9x + -9x Combine like terms: 2x + -9x = -7x -14 + -7x = -21 + 9x + -9x Combine like terms: 9x + -9x = 0 -14 + -7x = -21 + 0 -14 + -7x = -21 Add '14' to each side of the equation. -14 + 14 + -7x = -21 + 14 Combine like terms: -14 + 14 = 0 0 + -7x = -21 + 14 -7x = -21 + 14 Combine like terms: -21 + 14 = -7 -7x = -7 Divide each side by '-7'. x = 1 Simplifying x = 1
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