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Simplifying 4(a + -1b) = 5b (a * 4 + -1b * 4) = 5b (4a + -4b) = 5b Solving 4a + -4b = 5b Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4b' to each side of the equation. 4a + -4b + 4b = 5b + 4b Combine like terms: -4b + 4b = 0 4a + 0 = 5b + 4b 4a = 5b + 4b Combine like terms: 5b + 4b = 9b 4a = 9b Divide each side by '4'. a = 2.25b Simplifying a = 2.25b
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