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Simplifying 3a + 2.1 + 4a = -0.7 Reorder the terms: 2.1 + 3a + 4a = -0.7 Combine like terms: 3a + 4a = 7a 2.1 + 7a = -0.7 Solving 2.1 + 7a = -0.7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.1' to each side of the equation. 2.1 + -2.1 + 7a = -0.7 + -2.1 Combine like terms: 2.1 + -2.1 = 0.0 0.0 + 7a = -0.7 + -2.1 7a = -0.7 + -2.1 Combine like terms: -0.7 + -2.1 = -2.8 7a = -2.8 Divide each side by '7'. a = -0.4 Simplifying a = -0.4
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