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Simplifying (x + -7) + -1(4x + -20) = x + -4 Reorder the terms: (-7 + x) + -1(4x + -20) = x + -4 Remove parenthesis around (-7 + x) -7 + x + -1(4x + -20) = x + -4 Reorder the terms: -7 + x + -1(-20 + 4x) = x + -4 -7 + x + (-20 * -1 + 4x * -1) = x + -4 -7 + x + (20 + -4x) = x + -4 Reorder the terms: -7 + 20 + x + -4x = x + -4 Combine like terms: -7 + 20 = 13 13 + x + -4x = x + -4 Combine like terms: x + -4x = -3x 13 + -3x = x + -4 Reorder the terms: 13 + -3x = -4 + x Solving 13 + -3x = -4 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 13 + -3x + -1x = -4 + x + -1x Combine like terms: -3x + -1x = -4x 13 + -4x = -4 + x + -1x Combine like terms: x + -1x = 0 13 + -4x = -4 + 0 13 + -4x = -4 Add '-13' to each side of the equation. 13 + -13 + -4x = -4 + -13 Combine like terms: 13 + -13 = 0 0 + -4x = -4 + -13 -4x = -4 + -13 Combine like terms: -4 + -13 = -17 -4x = -17 Divide each side by '-4'. x = 4.25 Simplifying x = 4.25
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