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Simplifying 21 + -8x + -9 + -1(-7x) = 0 Remove parenthesis around (-7x) 21 + -8x + -9 + -1 * -7x = 0 Multiply -1 * -7 21 + -8x + -9 + 7x = 0 Reorder the terms: 21 + -9 + -8x + 7x = 0 Combine like terms: 21 + -9 = 12 12 + -8x + 7x = 0 Combine like terms: -8x + 7x = -1x 12 + -1x = 0 Solving 12 + -1x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -1x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = 0 + -12 -1x = 0 + -12 Combine like terms: 0 + -12 = -12 -1x = -12 Divide each side by '-1'. x = 12 Simplifying x = 12
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