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