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Simplifying 7a + 4 + -3a = 4.2a + 7 Reorder the terms: 4 + 7a + -3a = 4.2a + 7 Combine like terms: 7a + -3a = 4a 4 + 4a = 4.2a + 7 Reorder the terms: 4 + 4a = 7 + 4.2a Solving 4 + 4a = 7 + 4.2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4.2a' to each side of the equation. 4 + 4a + -4.2a = 7 + 4.2a + -4.2a Combine like terms: 4a + -4.2a = -0.2a 4 + -0.2a = 7 + 4.2a + -4.2a Combine like terms: 4.2a + -4.2a = 0.0 4 + -0.2a = 7 + 0.0 4 + -0.2a = 7 Add '-4' to each side of the equation. 4 + -4 + -0.2a = 7 + -4 Combine like terms: 4 + -4 = 0 0 + -0.2a = 7 + -4 -0.2a = 7 + -4 Combine like terms: 7 + -4 = 3 -0.2a = 3 Divide each side by '-0.2'. a = -15 Simplifying a = -15
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