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Simplifying 84 = 21y + -7x Reorder the terms: 84 = -7x + 21y Solving 84 = -7x + 21y Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 84 + 7x = -7x + 7x + 21y Combine like terms: -7x + 7x = 0 84 + 7x = 0 + 21y 84 + 7x = 21y Add '-84' to each side of the equation. 84 + -84 + 7x = -84 + 21y Combine like terms: 84 + -84 = 0 0 + 7x = -84 + 21y 7x = -84 + 21y Divide each side by '7'. x = -12 + 3y Simplifying x = -12 + 3y
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