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Simplifying -4x + -7y = 21 Solving -4x + -7y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7y' to each side of the equation. -4x + -7y + 7y = 21 + 7y Combine like terms: -7y + 7y = 0 -4x + 0 = 21 + 7y -4x = 21 + 7y Divide each side by '-4'. x = -5.25 + -1.75y Simplifying x = -5.25 + -1.75y
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