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Simplifying 21 = 3a + 2b Solving 21 = 3a + 2b Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 21 + -3a = 3a + -3a + 2b Combine like terms: 3a + -3a = 0 21 + -3a = 0 + 2b 21 + -3a = 2b Add '-21' to each side of the equation. 21 + -21 + -3a = -21 + 2b Combine like terms: 21 + -21 = 0 0 + -3a = -21 + 2b -3a = -21 + 2b Divide each side by '-3'. a = 7 + -0.6666666667b Simplifying a = 7 + -0.6666666667b
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