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Simplifying 21 = 7x + 3y Solving 21 = 7x + 3y Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 21 + -7x = 7x + -7x + 3y Combine like terms: 7x + -7x = 0 21 + -7x = 0 + 3y 21 + -7x = 3y Add '-21' to each side of the equation. 21 + -21 + -7x = -21 + 3y Combine like terms: 21 + -21 = 0 0 + -7x = -21 + 3y -7x = -21 + 3y Divide each side by '-7'. x = 3 + -0.4285714286y Simplifying x = 3 + -0.4285714286y
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