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Simplifying 20 + x = 70 + -1(20 + x) 20 + x = 70 + (20 * -1 + x * -1) 20 + x = 70 + (-20 + -1x) Combine like terms: 70 + -20 = 50 20 + x = 50 + -1x Solving 20 + x = 50 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 20 + x + x = 50 + -1x + x Combine like terms: x + x = 2x 20 + 2x = 50 + -1x + x Combine like terms: -1x + x = 0 20 + 2x = 50 + 0 20 + 2x = 50 Add '-20' to each side of the equation. 20 + -20 + 2x = 50 + -20 Combine like terms: 20 + -20 = 0 0 + 2x = 50 + -20 2x = 50 + -20 Combine like terms: 50 + -20 = 30 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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