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Simplifying 20 = -1(-7) + -1x Multiply -1 * -7 20 = 7 + -1x Solving 20 = 7 + -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 = 7 + -1x + x Combine like terms: -1x + x = 0 20 + x = 7 + 0 20 + x = 7 Add '-20' to each side of the equation. 20 + -20 + x = 7 + -20 Combine like terms: 20 + -20 = 0 0 + x = 7 + -20 x = 7 + -20 Combine like terms: 7 + -20 = -13 x = -13 Simplifying x = -13
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