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Simplifying (7x + 9) + (3y + -4) + (x + y) = 180 Reorder the terms: (9 + 7x) + (3y + -4) + (x + y) = 180 Remove parenthesis around (9 + 7x) 9 + 7x + (3y + -4) + (x + y) = 180 Reorder the terms: 9 + 7x + (-4 + 3y) + (x + y) = 180 Remove parenthesis around (-4 + 3y) 9 + 7x + -4 + 3y + (x + y) = 180 Remove parenthesis around (x + y) 9 + 7x + -4 + 3y + x + y = 180 Reorder the terms: 9 + -4 + 7x + x + 3y + y = 180 Combine like terms: 9 + -4 = 5 5 + 7x + x + 3y + y = 180 Combine like terms: 7x + x = 8x 5 + 8x + 3y + y = 180 Combine like terms: 3y + y = 4y 5 + 8x + 4y = 180 Solving 5 + 8x + 4y = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + 8x + -5 + 4y = 180 + -5 Reorder the terms: 5 + -5 + 8x + 4y = 180 + -5 Combine like terms: 5 + -5 = 0 0 + 8x + 4y = 180 + -5 8x + 4y = 180 + -5 Combine like terms: 180 + -5 = 175 8x + 4y = 175 Add '-4y' to each side of the equation. 8x + 4y + -4y = 175 + -4y Combine like terms: 4y + -4y = 0 8x + 0 = 175 + -4y 8x = 175 + -4y Divide each side by '8'. x = 21.875 + -0.5y Simplifying x = 21.875 + -0.5y
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