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Simplifying -2.1 = 3a + 10.5 Reorder the terms: -2.1 = 10.5 + 3a Solving -2.1 = 10.5 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. -2.1 + -3a = 10.5 + 3a + -3a Combine like terms: 3a + -3a = 0 -2.1 + -3a = 10.5 + 0 -2.1 + -3a = 10.5 Add '2.1' to each side of the equation. -2.1 + 2.1 + -3a = 10.5 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + -3a = 10.5 + 2.1 -3a = 10.5 + 2.1 Combine like terms: 10.5 + 2.1 = 12.6 -3a = 12.6 Divide each side by '-3'. a = -4.2 Simplifying a = -4.2
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