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Simplifying 3(a + -7) * 7 = 28 Reorder the terms: 3(-7 + a) * 7 = 28 Reorder the terms for easier multiplication: 3 * 7(-7 + a) = 28 Multiply 3 * 7 21(-7 + a) = 28 (-7 * 21 + a * 21) = 28 (-147 + 21a) = 28 Solving -147 + 21a = 28 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '147' to each side of the equation. -147 + 147 + 21a = 28 + 147 Combine like terms: -147 + 147 = 0 0 + 21a = 28 + 147 21a = 28 + 147 Combine like terms: 28 + 147 = 175 21a = 175 Divide each side by '21'. a = 8.333333333 Simplifying a = 8.333333333
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