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Simplifying 77 = 7(3 + x) 77 = (3 * 7 + x * 7) 77 = (21 + 7x) Solving 77 = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 77 + -7x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 77 + -7x = 21 + 0 77 + -7x = 21 Add '-77' to each side of the equation. 77 + -77 + -7x = 21 + -77 Combine like terms: 77 + -77 = 0 0 + -7x = 21 + -77 -7x = 21 + -77 Combine like terms: 21 + -77 = -56 -7x = -56 Divide each side by '-7'. x = 8 Simplifying x = 8
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