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Simplifying 3x + -12y + -21 = 0 Reorder the terms: -21 + 3x + -12y = 0 Solving -21 + 3x + -12y = 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 + -12y = 0 + 21 Reorder the terms: -21 + 21 + 3x + -12y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3x + -12y = 0 + 21 3x + -12y = 0 + 21 Combine like terms: 0 + 21 = 21 3x + -12y = 21 Add '12y' to each side of the equation. 3x + -12y + 12y = 21 + 12y Combine like terms: -12y + 12y = 0 3x + 0 = 21 + 12y 3x = 21 + 12y Divide each side by '3'. x = 7 + 4y Simplifying x = 7 + 4y
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