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Simplifying -3x + 8y + -21 = 0 Reorder the terms: -21 + -3x + 8y = 0 Solving -21 + -3x + 8y = 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 + 8y = 0 + 21 Reorder the terms: -21 + 21 + -3x + 8y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -3x + 8y = 0 + 21 -3x + 8y = 0 + 21 Combine like terms: 0 + 21 = 21 -3x + 8y = 21 Add '-8y' to each side of the equation. -3x + 8y + -8y = 21 + -8y Combine like terms: 8y + -8y = 0 -3x + 0 = 21 + -8y -3x = 21 + -8y Divide each side by '-3'. x = -7 + 2.666666667y Simplifying x = -7 + 2.666666667y
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