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Simplifying 20y + -15y + 2x + 10y + 21 = 180 Reorder the terms: 21 + 2x + 20y + -15y + 10y = 180 Combine like terms: 20y + -15y = 5y 21 + 2x + 5y + 10y = 180 Combine like terms: 5y + 10y = 15y 21 + 2x + 15y = 180 Solving 21 + 2x + 15y = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 2x + -21 + 15y = 180 + -21 Reorder the terms: 21 + -21 + 2x + 15y = 180 + -21 Combine like terms: 21 + -21 = 0 0 + 2x + 15y = 180 + -21 2x + 15y = 180 + -21 Combine like terms: 180 + -21 = 159 2x + 15y = 159 Add '-15y' to each side of the equation. 2x + 15y + -15y = 159 + -15y Combine like terms: 15y + -15y = 0 2x + 0 = 159 + -15y 2x = 159 + -15y Divide each side by '2'. x = 79.5 + -7.5y Simplifying x = 79.5 + -7.5y
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