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