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Simplifying -7x + -21y = 28 Solving -7x + -21y = 28 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. -7x + -21y + 21y = 28 + 21y Combine like terms: -21y + 21y = 0 -7x + 0 = 28 + 21y -7x = 28 + 21y Divide each side by '-7'. x = -4 + -3y Simplifying x = -4 + -3y
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