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Simplifying 7y + x = 21 Reorder the terms: 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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