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