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Simplifying 20 + (-7 + 2x) + -1(-3x + -7) = 0 Remove parenthesis around (-7 + 2x) 20 + -7 + 2x + -1(-3x + -7) = 0 Reorder the terms: 20 + -7 + 2x + -1(-7 + -3x) = 0 20 + -7 + 2x + (-7 * -1 + -3x * -1) = 0 20 + -7 + 2x + (7 + 3x) = 0 Reorder the terms: 20 + -7 + 7 + 2x + 3x = 0 Combine like terms: 20 + -7 = 13 13 + 7 + 2x + 3x = 0 Combine like terms: 13 + 7 = 20 20 + 2x + 3x = 0 Combine like terms: 2x + 3x = 5x 20 + 5x = 0 Solving 20 + 5x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 5x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 5x = 0 + -20 5x = 0 + -20 Combine like terms: 0 + -20 = -20 5x = -20 Divide each side by '5'. x = -4 Simplifying x = -4
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