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Simplifying -7(-7 + -3x) + -6x = 139 (-7 * -7 + -3x * -7) + -6x = 139 (49 + 21x) + -6x = 139 Combine like terms: 21x + -6x = 15x 49 + 15x = 139 Solving 49 + 15x = 139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + 15x = 139 + -49 Combine like terms: 49 + -49 = 0 0 + 15x = 139 + -49 15x = 139 + -49 Combine like terms: 139 + -49 = 90 15x = 90 Divide each side by '15'. x = 6 Simplifying x = 6
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