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Simplifying 4a + -2.1 = 9a + 5.4 Reorder the terms: -2.1 + 4a = 9a + 5.4 Reorder the terms: -2.1 + 4a = 5.4 + 9a Solving -2.1 + 4a = 5.4 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. -2.1 + 4a + -9a = 5.4 + 9a + -9a Combine like terms: 4a + -9a = -5a -2.1 + -5a = 5.4 + 9a + -9a Combine like terms: 9a + -9a = 0 -2.1 + -5a = 5.4 + 0 -2.1 + -5a = 5.4 Add '2.1' to each side of the equation. -2.1 + 2.1 + -5a = 5.4 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + -5a = 5.4 + 2.1 -5a = 5.4 + 2.1 Combine like terms: 5.4 + 2.1 = 7.5 -5a = 7.5 Divide each side by '-5'. a = -1.5 Simplifying a = -1.5
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