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Simplifying 11 + (3a + -7a) = -21 Combine like terms: 3a + -7a = -4a 11 + (-4a) = -21 11 + (-4a) = -21 Solving 11 + (-4a) = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + (-4a) = -21 + -11 Combine like terms: 11 + -11 = 0 0 + (-4a) = -21 + -11 (-4a) = -21 + -11 Combine like terms: -21 + -11 = -32 (-4a) = -32 Divide each side by '-4'. a = 8 Simplifying a = 8
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