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Simplifying 3x + y + 2(x + y) = 30 3x + y + (x * 2 + y * 2) = 30 3x + y + (2x + 2y) = 30 Reorder the terms: 3x + 2x + y + 2y = 30 Combine like terms: 3x + 2x = 5x 5x + y + 2y = 30 Combine like terms: y + 2y = 3y 5x + 3y = 30 Solving 5x + 3y = 30 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3y' to each side of the equation. 5x + 3y + -3y = 30 + -3y Combine like terms: 3y + -3y = 0 5x + 0 = 30 + -3y 5x = 30 + -3y Divide each side by '5'. x = 6 + -0.6y Simplifying x = 6 + -0.6y
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