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Simplifying 121 = 5x + 7(2x + 1) Reorder the terms: 121 = 5x + 7(1 + 2x) 121 = 5x + (1 * 7 + 2x * 7) 121 = 5x + (7 + 14x) Reorder the terms: 121 = 7 + 5x + 14x Combine like terms: 5x + 14x = 19x 121 = 7 + 19x Solving 121 = 7 + 19x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-19x' to each side of the equation. 121 + -19x = 7 + 19x + -19x Combine like terms: 19x + -19x = 0 121 + -19x = 7 + 0 121 + -19x = 7 Add '-121' to each side of the equation. 121 + -121 + -19x = 7 + -121 Combine like terms: 121 + -121 = 0 0 + -19x = 7 + -121 -19x = 7 + -121 Combine like terms: 7 + -121 = -114 -19x = -114 Divide each side by '-19'. x = 6 Simplifying x = 6
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