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Simplifying 2a + 6b + -1x = 21 Solving 2a + 6b + -1x = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6b' to each side of the equation. 2a + 6b + -6b + -1x = 21 + -6b Combine like terms: 6b + -6b = 0 2a + 0 + -1x = 21 + -6b 2a + -1x = 21 + -6b Add 'x' to each side of the equation. 2a + -1x + x = 21 + -6b + x Combine like terms: -1x + x = 0 2a + 0 = 21 + -6b + x 2a = 21 + -6b + x Divide each side by '2'. a = 10.5 + -3b + 0.5x Simplifying a = 10.5 + -3b + 0.5x
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