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