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