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Simplifying 660 = 2a + 4(230 + -1a) 660 = 2a + (230 * 4 + -1a * 4) 660 = 2a + (920 + -4a) Reorder the terms: 660 = 920 + 2a + -4a Combine like terms: 2a + -4a = -2a 660 = 920 + -2a Solving 660 = 920 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 660 + 2a = 920 + -2a + 2a Combine like terms: -2a + 2a = 0 660 + 2a = 920 + 0 660 + 2a = 920 Add '-660' to each side of the equation. 660 + -660 + 2a = 920 + -660 Combine like terms: 660 + -660 = 0 0 + 2a = 920 + -660 2a = 920 + -660 Combine like terms: 920 + -660 = 260 2a = 260 Divide each side by '2'. a = 130 Simplifying a = 130
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