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Simplifying 90 + -1a + 180 + -2a = 7x Reorder the terms: 90 + 180 + -1a + -2a = 7x Combine like terms: 90 + 180 = 270 270 + -1a + -2a = 7x Combine like terms: -1a + -2a = -3a 270 + -3a = 7x Solving 270 + -3a = 7x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-270' to each side of the equation. 270 + -270 + -3a = -270 + 7x Combine like terms: 270 + -270 = 0 0 + -3a = -270 + 7x -3a = -270 + 7x Divide each side by '-3'. a = 90 + -2.333333333x Simplifying a = 90 + -2.333333333x
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