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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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