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Simplifying 7(a + 3) * 21 = 91 Reorder the terms: 7(3 + a) * 21 = 91 Reorder the terms for easier multiplication: 7 * 21(3 + a) = 91 Multiply 7 * 21 147(3 + a) = 91 (3 * 147 + a * 147) = 91 (441 + 147a) = 91 Solving 441 + 147a = 91 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-441' to each side of the equation. 441 + -441 + 147a = 91 + -441 Combine like terms: 441 + -441 = 0 0 + 147a = 91 + -441 147a = 91 + -441 Combine like terms: 91 + -441 = -350 147a = -350 Divide each side by '147'. a = -2.380952381 Simplifying a = -2.380952381
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