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