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Simplifying 21x + 15y = 0 Solving 21x + 15y = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15y' to each side of the equation. 21x + 15y + -15y = 0 + -15y Combine like terms: 15y + -15y = 0 21x + 0 = 0 + -15y 21x = 0 + -15y Remove the zero: 21x = -15y Divide each side by '21'. x = -0.7142857143y Simplifying x = -0.7142857143y
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