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Simplifying 20 = 4(a) + 5(b) Solving 20 = 4a + 5b Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 20 + -4a = 4a + -4a + 5b Combine like terms: 4a + -4a = 0 20 + -4a = 0 + 5b 20 + -4a = 5b Add '-20' to each side of the equation. 20 + -20 + -4a = -20 + 5b Combine like terms: 20 + -20 = 0 0 + -4a = -20 + 5b -4a = -20 + 5b Divide each side by '-4'. a = 5 + -1.25b Simplifying a = 5 + -1.25b
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