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Simplifying 7x + y + -21 = -2y Reorder the terms: -21 + 7x + y = -2y Solving -21 + 7x + y = -2y 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 + y = 21 + -2y Reorder the terms: -21 + 21 + 7x + y = 21 + -2y Combine like terms: -21 + 21 = 0 0 + 7x + y = 21 + -2y 7x + y = 21 + -2y Add '-1y' to each side of the equation. 7x + y + -1y = 21 + -2y + -1y Combine like terms: y + -1y = 0 7x + 0 = 21 + -2y + -1y 7x = 21 + -2y + -1y Combine like terms: -2y + -1y = -3y 7x = 21 + -3y Divide each side by '7'. x = 3 + -0.4285714286y Simplifying x = 3 + -0.4285714286y
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