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Simplifying -1a + -4a + 9a + -7 + 2b = 0 Reorder the terms: -7 + -1a + -4a + 9a + 2b = 0 Combine like terms: -1a + -4a = -5a -7 + -5a + 9a + 2b = 0 Combine like terms: -5a + 9a = 4a -7 + 4a + 2b = 0 Solving -7 + 4a + 2b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 4a + 7 + 2b = 0 + 7 Reorder the terms: -7 + 7 + 4a + 2b = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 4a + 2b = 0 + 7 4a + 2b = 0 + 7 Combine like terms: 0 + 7 = 7 4a + 2b = 7 Add '-2b' to each side of the equation. 4a + 2b + -2b = 7 + -2b Combine like terms: 2b + -2b = 0 4a + 0 = 7 + -2b 4a = 7 + -2b Divide each side by '4'. a = 1.75 + -0.5b Simplifying a = 1.75 + -0.5b
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