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Simplifying 21 = 10a + 4b Solving 21 = 10a + 4b Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10a' to each side of the equation. 21 + -10a = 10a + -10a + 4b Combine like terms: 10a + -10a = 0 21 + -10a = 0 + 4b 21 + -10a = 4b Add '-21' to each side of the equation. 21 + -21 + -10a = -21 + 4b Combine like terms: 21 + -21 = 0 0 + -10a = -21 + 4b -10a = -21 + 4b Divide each side by '-10'. a = 2.1 + -0.4b Simplifying a = 2.1 + -0.4b
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