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Simplifying (2a + -5) + (-7a + 1) = 0 Reorder the terms: (-5 + 2a) + (-7a + 1) = 0 Remove parenthesis around (-5 + 2a) -5 + 2a + (-7a + 1) = 0 Reorder the terms: -5 + 2a + (1 + -7a) = 0 Remove parenthesis around (1 + -7a) -5 + 2a + 1 + -7a = 0 Reorder the terms: -5 + 1 + 2a + -7a = 0 Combine like terms: -5 + 1 = -4 -4 + 2a + -7a = 0 Combine like terms: 2a + -7a = -5a -4 + -5a = 0 Solving -4 + -5a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -5a = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5a = 0 + 4 -5a = 0 + 4 Combine like terms: 0 + 4 = 4 -5a = 4 Divide each side by '-5'. a = -0.8 Simplifying a = -0.8
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