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Simplifying 20 + 12x + (-13) + (-21x) = 0 20 + 12x + -13 + (-21x) = 0 Reorder the terms: 20 + -13 + 12x + (-21x) = 0 Combine like terms: 20 + -13 = 7 7 + 12x + (-21x) = 0 Combine like terms: 12x + (-21x) = -9x 7 + -9x = 0 Solving 7 + -9x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -9x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -9x = 0 + -7 -9x = 0 + -7 Combine like terms: 0 + -7 = -7 -9x = -7 Divide each side by '-9'. x = 0.7777777778 Simplifying x = 0.7777777778
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