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Simplifying 10x + y + 5x + 21 = 180 Reorder the terms: 21 + 10x + 5x + y = 180 Combine like terms: 10x + 5x = 15x 21 + 15x + y = 180 Solving 21 + 15x + y = 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 + 15x + -21 + y = 180 + -21 Reorder the terms: 21 + -21 + 15x + y = 180 + -21 Combine like terms: 21 + -21 = 0 0 + 15x + y = 180 + -21 15x + y = 180 + -21 Combine like terms: 180 + -21 = 159 15x + y = 159 Add '-1y' to each side of the equation. 15x + y + -1y = 159 + -1y Combine like terms: y + -1y = 0 15x + 0 = 159 + -1y 15x = 159 + -1y Divide each side by '15'. x = 10.6 + -0.06666666667y Simplifying x = 10.6 + -0.06666666667y
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