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Simplifying 4(5 + -1a) + -2.1(6a) = -4.9 (5 * 4 + -1a * 4) + -2.1(6a) = -4.9 (20 + -4a) + -2.1(6a) = -4.9 Remove parenthesis around (6a) 20 + -4a + -2.1 * 6a = -4.9 Multiply -2.1 * 6 20 + -4a + -12.6a = -4.9 Combine like terms: -4a + -12.6a = -16.6a 20 + -16.6a = -4.9 Solving 20 + -16.6a = -4.9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -16.6a = -4.9 + -20 Combine like terms: 20 + -20 = 0 0 + -16.6a = -4.9 + -20 -16.6a = -4.9 + -20 Combine like terms: -4.9 + -20 = -24.9 -16.6a = -24.9 Divide each side by '-16.6'. a = 1.5 Simplifying a = 1.5
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