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Simplifying 7 + -21a = 0 Solving 7 + -21a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -21a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -21a = 0 + -7 -21a = 0 + -7 Combine like terms: 0 + -7 = -7 -21a = -7 Divide each side by '-21'. a = 0.3333333333 Simplifying a = 0.3333333333
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