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Simplifying 168 = 7(3 + 7x) 168 = (3 * 7 + 7x * 7) 168 = (21 + 49x) Solving 168 = 21 + 49x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-49x' to each side of the equation. 168 + -49x = 21 + 49x + -49x Combine like terms: 49x + -49x = 0 168 + -49x = 21 + 0 168 + -49x = 21 Add '-168' to each side of the equation. 168 + -168 + -49x = 21 + -168 Combine like terms: 168 + -168 = 0 0 + -49x = 21 + -168 -49x = 21 + -168 Combine like terms: 21 + -168 = -147 -49x = -147 Divide each side by '-49'. x = 3 Simplifying x = 3
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