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Simplifying 870 + -1(5x + 8y + 20) = 105 Reorder the terms: 870 + -1(20 + 5x + 8y) = 105 870 + (20 * -1 + 5x * -1 + 8y * -1) = 105 870 + (-20 + -5x + -8y) = 105 Combine like terms: 870 + -20 = 850 850 + -5x + -8y = 105 Solving 850 + -5x + -8y = 105 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-850' to each side of the equation. 850 + -5x + -850 + -8y = 105 + -850 Reorder the terms: 850 + -850 + -5x + -8y = 105 + -850 Combine like terms: 850 + -850 = 0 0 + -5x + -8y = 105 + -850 -5x + -8y = 105 + -850 Combine like terms: 105 + -850 = -745 -5x + -8y = -745 Add '8y' to each side of the equation. -5x + -8y + 8y = -745 + 8y Combine like terms: -8y + 8y = 0 -5x + 0 = -745 + 8y -5x = -745 + 8y Divide each side by '-5'. x = 149 + -1.6y Simplifying x = 149 + -1.6y
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