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Simplifying ab + 2a + -2b + 4 = ab Reorder the terms: 4 + 2a + ab + -2b = ab Add '-1ab' to each side of the equation. 4 + 2a + ab + -1ab + -2b = ab + -1ab Combine like terms: ab + -1ab = 0 4 + 2a + 0 + -2b = ab + -1ab 4 + 2a + -2b = ab + -1ab Combine like terms: ab + -1ab = 0 4 + 2a + -2b = 0 Solving 4 + 2a + -2b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + 2a + -4 + -2b = 0 + -4 Reorder the terms: 4 + -4 + 2a + -2b = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 2a + -2b = 0 + -4 2a + -2b = 0 + -4 Combine like terms: 0 + -4 = -4 2a + -2b = -4 Add '2b' to each side of the equation. 2a + -2b + 2b = -4 + 2b Combine like terms: -2b + 2b = 0 2a + 0 = -4 + 2b 2a = -4 + 2b Divide each side by '2'. a = -2 + b Simplifying a = -2 + b
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