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Simplifying 137 = 7(7 + -3x) + 4 137 = (7 * 7 + -3x * 7) + 4 137 = (49 + -21x) + 4 Reorder the terms: 137 = 49 + 4 + -21x Combine like terms: 49 + 4 = 53 137 = 53 + -21x Solving 137 = 53 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 137 + 21x = 53 + -21x + 21x Combine like terms: -21x + 21x = 0 137 + 21x = 53 + 0 137 + 21x = 53 Add '-137' to each side of the equation. 137 + -137 + 21x = 53 + -137 Combine like terms: 137 + -137 = 0 0 + 21x = 53 + -137 21x = 53 + -137 Combine like terms: 53 + -137 = -84 21x = -84 Divide each side by '21'. x = -4 Simplifying x = -4
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