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Simplifying 21 = -3x + -7y Solving 21 = -3x + -7y Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 21 + 3x = -3x + 3x + -7y Combine like terms: -3x + 3x = 0 21 + 3x = 0 + -7y 21 + 3x = -7y Add '-21' to each side of the equation. 21 + -21 + 3x = -21 + -7y Combine like terms: 21 + -21 = 0 0 + 3x = -21 + -7y 3x = -21 + -7y Divide each side by '3'. x = -7 + -2.333333333y Simplifying x = -7 + -2.333333333y
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