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Simplifying 21y + -7x = 84 Reorder the terms: -7x + 21y = 84 Solving -7x + 21y = 84 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 = 84 + -21y Combine like terms: 21y + -21y = 0 -7x + 0 = 84 + -21y -7x = 84 + -21y Divide each side by '-7'. x = -12 + 3y Simplifying x = -12 + 3y
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