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Simplifying 7x + -4(7x + -13) = 220 Reorder the terms: 7x + -4(-13 + 7x) = 220 7x + (-13 * -4 + 7x * -4) = 220 7x + (52 + -28x) = 220 Reorder the terms: 52 + 7x + -28x = 220 Combine like terms: 7x + -28x = -21x 52 + -21x = 220 Solving 52 + -21x = 220 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-52' to each side of the equation. 52 + -52 + -21x = 220 + -52 Combine like terms: 52 + -52 = 0 0 + -21x = 220 + -52 -21x = 220 + -52 Combine like terms: 220 + -52 = 168 -21x = 168 Divide each side by '-21'. x = -8 Simplifying x = -8
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