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Simplifying -4.2 = -0.84(a + 4) Reorder the terms: -4.2 = -0.84(4 + a) -4.2 = (4 * -0.84 + a * -0.84) -4.2 = (-3.36 + -0.84a) Solving -4.2 = -3.36 + -0.84a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.84a' to each side of the equation. -4.2 + 0.84a = -3.36 + -0.84a + 0.84a Combine like terms: -0.84a + 0.84a = 0.00 -4.2 + 0.84a = -3.36 + 0.00 -4.2 + 0.84a = -3.36 Add '4.2' to each side of the equation. -4.2 + 4.2 + 0.84a = -3.36 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + 0.84a = -3.36 + 4.2 0.84a = -3.36 + 4.2 Combine like terms: -3.36 + 4.2 = 0.84 0.84a = 0.84 Divide each side by '0.84'. a = 1 Simplifying a = 1
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