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Simplifying 3x + -4(x + -5) = 7 Reorder the terms: 3x + -4(-5 + x) = 7 3x + (-5 * -4 + x * -4) = 7 3x + (20 + -4x) = 7 Reorder the terms: 20 + 3x + -4x = 7 Combine like terms: 3x + -4x = -1x 20 + -1x = 7 Solving 20 + -1x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -1x = 7 + -20 Combine like terms: 20 + -20 = 0 0 + -1x = 7 + -20 -1x = 7 + -20 Combine like terms: 7 + -20 = -13 -1x = -13 Divide each side by '-1'. x = 13 Simplifying x = 13
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