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Simplifying 7 = a + -1(-4) * a Multiply -1 * -4 7 = a + 4a Combine like terms: a + 4a = 5a 7 = 5a Solving 7 = 5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5a' to each side of the equation. 7 + -5a = 5a + -5a Combine like terms: 5a + -5a = 0 7 + -5a = 0 Add '-7' to each side of the equation. 7 + -7 + -5a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -5a = 0 + -7 -5a = 0 + -7 Combine like terms: 0 + -7 = -7 -5a = -7 Divide each side by '-5'. a = 1.4 Simplifying a = 1.4
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