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Simplifying 3x + -7(3x + -7) = 13 Reorder the terms: 3x + -7(-7 + 3x) = 13 3x + (-7 * -7 + 3x * -7) = 13 3x + (49 + -21x) = 13 Reorder the terms: 49 + 3x + -21x = 13 Combine like terms: 3x + -21x = -18x 49 + -18x = 13 Solving 49 + -18x = 13 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 + -18x = 13 + -49 Combine like terms: 49 + -49 = 0 0 + -18x = 13 + -49 -18x = 13 + -49 Combine like terms: 13 + -49 = -36 -18x = -36 Divide each side by '-18'. x = 2 Simplifying x = 2
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