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Simplifying 7x + 3y = (-21) 7x + 3y = -21 Solving 7x + 3y = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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