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Simplifying 7x + y = 21 Solving 7x + y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1y' to each side of the equation. 7x + y + -1y = 21 + -1y Combine like terms: y + -1y = 0 7x + 0 = 21 + -1y 7x = 21 + -1y Divide each side by '7'. x = 3 + -0.1428571429y Simplifying x = 3 + -0.1428571429y
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