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Simplifying 6x + -3(7x + -13) = -126 Reorder the terms: 6x + -3(-13 + 7x) = -126 6x + (-13 * -3 + 7x * -3) = -126 6x + (39 + -21x) = -126 Reorder the terms: 39 + 6x + -21x = -126 Combine like terms: 6x + -21x = -15x 39 + -15x = -126 Solving 39 + -15x = -126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + -15x = -126 + -39 Combine like terms: 39 + -39 = 0 0 + -15x = -126 + -39 -15x = -126 + -39 Combine like terms: -126 + -39 = -165 -15x = -165 Divide each side by '-15'. x = 11 Simplifying x = 11
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