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Simplifying (7x + 2y) + -1(3x + -2y) = 20 Remove parenthesis around (7x + 2y) 7x + 2y + -1(3x + -2y) = 20 7x + 2y + (3x * -1 + -2y * -1) = 20 7x + 2y + (-3x + 2y) = 20 Reorder the terms: 7x + -3x + 2y + 2y = 20 Combine like terms: 7x + -3x = 4x 4x + 2y + 2y = 20 Combine like terms: 2y + 2y = 4y 4x + 4y = 20 Solving 4x + 4y = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4y' to each side of the equation. 4x + 4y + -4y = 20 + -4y Combine like terms: 4y + -4y = 0 4x + 0 = 20 + -4y 4x = 20 + -4y Divide each side by '4'. x = 5 + -1y Simplifying x = 5 + -1y
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