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