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Simplifying 10x + -7y = -21 Solving 10x + -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. 10x + -7y + 7y = -21 + 7y Combine like terms: -7y + 7y = 0 10x + 0 = -21 + 7y 10x = -21 + 7y Divide each side by '10'. x = -2.1 + 0.7y Simplifying x = -2.1 + 0.7y
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