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