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