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Simplifying -5x + 7y = 21 Solving -5x + 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. -5x + 7y + -7y = 21 + -7y Combine like terms: 7y + -7y = 0 -5x + 0 = 21 + -7y -5x = 21 + -7y Divide each side by '-5'. x = -4.2 + 1.4y Simplifying x = -4.2 + 1.4y
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