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Simplifying (2x + y) + (5x + y) = 80 Remove parenthesis around (2x + y) 2x + y + (5x + y) = 80 Remove parenthesis around (5x + y) 2x + y + 5x + y = 80 Reorder the terms: 2x + 5x + y + y = 80 Combine like terms: 2x + 5x = 7x 7x + y + y = 80 Combine like terms: y + y = 2y 7x + 2y = 80 Solving 7x + 2y = 80 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2y' to each side of the equation. 7x + 2y + -2y = 80 + -2y Combine like terms: 2y + -2y = 0 7x + 0 = 80 + -2y 7x = 80 + -2y Divide each side by '7'. x = 11.42857143 + -0.2857142857y Simplifying x = 11.42857143 + -0.2857142857y
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