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Simplifying 7(x + 3a) = b Reorder the terms: 7(3a + x) = b (3a * 7 + x * 7) = b (21a + 7x) = b Solving 21a + 7x = b Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7x' to each side of the equation. 21a + 7x + -7x = b + -7x Combine like terms: 7x + -7x = 0 21a + 0 = b + -7x 21a = b + -7x Divide each side by '21'. a = 0.04761904762b + -0.3333333333x Simplifying a = 0.04761904762b + -0.3333333333x
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