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Simplifying 4x + 21y = -9 Solving 4x + 21y = -9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21y' to each side of the equation. 4x + 21y + -21y = -9 + -21y Combine like terms: 21y + -21y = 0 4x + 0 = -9 + -21y 4x = -9 + -21y Divide each side by '4'. x = -2.25 + -5.25y Simplifying x = -2.25 + -5.25y
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