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Simplifying 100 = 40 + -2a Solving 100 = 40 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 100 + 2a = 40 + -2a + 2a Combine like terms: -2a + 2a = 0 100 + 2a = 40 + 0 100 + 2a = 40 Add '-100' to each side of the equation. 100 + -100 + 2a = 40 + -100 Combine like terms: 100 + -100 = 0 0 + 2a = 40 + -100 2a = 40 + -100 Combine like terms: 40 + -100 = -60 2a = -60 Divide each side by '2'. a = -30 Simplifying a = -30
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