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Simplifying 91 = 2(37 + -1a) + 37 91 = (37 * 2 + -1a * 2) + 37 91 = (74 + -2a) + 37 Reorder the terms: 91 = 74 + 37 + -2a Combine like terms: 74 + 37 = 111 91 = 111 + -2a Solving 91 = 111 + -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. 91 + 2a = 111 + -2a + 2a Combine like terms: -2a + 2a = 0 91 + 2a = 111 + 0 91 + 2a = 111 Add '-91' to each side of the equation. 91 + -91 + 2a = 111 + -91 Combine like terms: 91 + -91 = 0 0 + 2a = 111 + -91 2a = 111 + -91 Combine like terms: 111 + -91 = 20 2a = 20 Divide each side by '2'. a = 10 Simplifying a = 10
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