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Simplifying 2(90 + -1a) + (a + 10) = 90 (90 * 2 + -1a * 2) + (a + 10) = 90 (180 + -2a) + (a + 10) = 90 Reorder the terms: 180 + -2a + (10 + a) = 90 Remove parenthesis around (10 + a) 180 + -2a + 10 + a = 90 Reorder the terms: 180 + 10 + -2a + a = 90 Combine like terms: 180 + 10 = 190 190 + -2a + a = 90 Combine like terms: -2a + a = -1a 190 + -1a = 90 Solving 190 + -1a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-190' to each side of the equation. 190 + -190 + -1a = 90 + -190 Combine like terms: 190 + -190 = 0 0 + -1a = 90 + -190 -1a = 90 + -190 Combine like terms: 90 + -190 = -100 -1a = -100 Divide each side by '-1'. a = 100 Simplifying a = 100
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