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Simplifying 90 + -1(-20x) = 70 Remove parenthesis around (-20x) 90 + -1 * -20x = 70 Multiply -1 * -20 90 + 20x = 70 Solving 90 + 20x = 70 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 20x = 70 + -90 Combine like terms: 90 + -90 = 0 0 + 20x = 70 + -90 20x = 70 + -90 Combine like terms: 70 + -90 = -20 20x = -20 Divide each side by '20'. x = -1 Simplifying x = -1
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