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Simplifying a + b + c + d + 90 + 80 = 100 Reorder the terms: 90 + 80 + a + b + c + d = 100 Combine like terms: 90 + 80 = 170 170 + a + b + c + d = 100 Solving 170 + a + b + c + d = 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 + b + c + -170 + d = 100 + -170 Reorder the terms: 170 + -170 + a + b + c + d = 100 + -170 Combine like terms: 170 + -170 = 0 0 + a + b + c + d = 100 + -170 a + b + c + d = 100 + -170 Combine like terms: 100 + -170 = -70 a + b + c + d = -70 Add '-1b' to each side of the equation. a + b + c + -1b + d = -70 + -1b Reorder the terms: a + b + -1b + c + d = -70 + -1b Combine like terms: b + -1b = 0 a + 0 + c + d = -70 + -1b a + c + d = -70 + -1b Add '-1c' to each side of the equation. a + c + -1c + d = -70 + -1b + -1c Combine like terms: c + -1c = 0 a + 0 + d = -70 + -1b + -1c a + d = -70 + -1b + -1c Add '-1d' to each side of the equation. a + d + -1d = -70 + -1b + -1c + -1d Combine like terms: d + -1d = 0 a + 0 = -70 + -1b + -1c + -1d a = -70 + -1b + -1c + -1d Simplifying a = -70 + -1b + -1c + -1d
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