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Simplifying 7x + -3y + 21 = 0 Reorder the terms: 21 + 7x + -3y = 0 Solving 21 + 7x + -3y = 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 + 7x + -21 + -3y = 0 + -21 Reorder the terms: 21 + -21 + 7x + -3y = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7x + -3y = 0 + -21 7x + -3y = 0 + -21 Combine like terms: 0 + -21 = -21 7x + -3y = -21 Add '3y' to each side of the equation. 7x + -3y + 3y = -21 + 3y Combine like terms: -3y + 3y = 0 7x + 0 = -21 + 3y 7x = -21 + 3y Divide each side by '7'. x = -3 + 0.4285714286y Simplifying x = -3 + 0.4285714286y
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