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Simplifying 2(u + 3) + -7U = 21 Reorder the terms: 2(3 + u) + -7U = 21 (3 * 2 + u * 2) + -7U = 21 (6 + 2u) + -7U = 21 Reorder the terms: 6 + -7U + 2u = 21 Solving 6 + -7U + 2u = 21 Solving for variable 'U'. Move all terms containing U to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -7U + -6 + 2u = 21 + -6 Reorder the terms: 6 + -6 + -7U + 2u = 21 + -6 Combine like terms: 6 + -6 = 0 0 + -7U + 2u = 21 + -6 -7U + 2u = 21 + -6 Combine like terms: 21 + -6 = 15 -7U + 2u = 15 Add '-2u' to each side of the equation. -7U + 2u + -2u = 15 + -2u Combine like terms: 2u + -2u = 0 -7U + 0 = 15 + -2u -7U = 15 + -2u Divide each side by '-7'. U = -2.142857143 + 0.2857142857u Simplifying U = -2.142857143 + 0.2857142857u
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