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Simplifying 12x + 21y = 128 Solving 12x + 21y = 128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21y' to each side of the equation. 12x + 21y + -21y = 128 + -21y Combine like terms: 21y + -21y = 0 12x + 0 = 128 + -21y 12x = 128 + -21y Divide each side by '12'. x = 10.66666667 + -1.75y Simplifying x = 10.66666667 + -1.75y
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