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Simplifying 3x + -21y = 9 Solving 3x + -21y = 9 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. 3x + -21y + 21y = 9 + 21y Combine like terms: -21y + 21y = 0 3x + 0 = 9 + 21y 3x = 9 + 21y Divide each side by '3'. x = 3 + 7y Simplifying x = 3 + 7y
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