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Simplifying 4x + -1y = 21 Solving 4x + -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. 4x + -1y + y = 21 + y Combine like terms: -1y + y = 0 4x + 0 = 21 + y 4x = 21 + y Divide each side by '4'. x = 5.25 + 0.25y Simplifying x = 5.25 + 0.25y
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