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Simplifying -81 = 7 + -2(4 + 5x) -81 = 7 + (4 * -2 + 5x * -2) -81 = 7 + (-8 + -10x) Combine like terms: 7 + -8 = -1 -81 = -1 + -10x Solving -81 = -1 + -10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10x' to each side of the equation. -81 + 10x = -1 + -10x + 10x Combine like terms: -10x + 10x = 0 -81 + 10x = -1 + 0 -81 + 10x = -1 Add '81' to each side of the equation. -81 + 81 + 10x = -1 + 81 Combine like terms: -81 + 81 = 0 0 + 10x = -1 + 81 10x = -1 + 81 Combine like terms: -1 + 81 = 80 10x = 80 Divide each side by '10'. x = 8 Simplifying x = 8
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