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Simplifying a + b + 80 + 90 = 100 Reorder the terms: 80 + 90 + a + b = 100 Combine like terms: 80 + 90 = 170 170 + a + b = 100 Solving 170 + a + b = 100 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-170' to each side of the equation. 170 + a + -170 + b = 100 + -170 Reorder the terms: 170 + -170 + a + b = 100 + -170 Combine like terms: 170 + -170 = 0 0 + a + b = 100 + -170 a + b = 100 + -170 Combine like terms: 100 + -170 = -70 a + b = -70 Add '-1b' to each side of the equation. a + b + -1b = -70 + -1b Combine like terms: b + -1b = 0 a + 0 = -70 + -1b a = -70 + -1b Simplifying a = -70 + -1b
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