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Simplifying (15 + -1a + b) + x = 90 Remove parenthesis around (15 + -1a + b) 15 + -1a + b + x = 90 Solving 15 + -1a + b + x = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -1a + b + -15 + x = 90 + -15 Reorder the terms: 15 + -15 + -1a + b + x = 90 + -15 Combine like terms: 15 + -15 = 0 0 + -1a + b + x = 90 + -15 -1a + b + x = 90 + -15 Combine like terms: 90 + -15 = 75 -1a + b + x = 75 Add '-1b' to each side of the equation. -1a + b + -1b + x = 75 + -1b Combine like terms: b + -1b = 0 -1a + 0 + x = 75 + -1b -1a + x = 75 + -1b Add '-1x' to each side of the equation. -1a + x + -1x = 75 + -1b + -1x Combine like terms: x + -1x = 0 -1a + 0 = 75 + -1b + -1x -1a = 75 + -1b + -1x Divide each side by '-1'. a = -75 + b + x Simplifying a = -75 + b + x
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