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Simplifying 7x + 3(7 + -1x) = (x + 4) 7x + (7 * 3 + -1x * 3) = (x + 4) 7x + (21 + -3x) = (x + 4) Reorder the terms: 21 + 7x + -3x = (x + 4) Combine like terms: 7x + -3x = 4x 21 + 4x = (x + 4) Reorder the terms: 21 + 4x = (4 + x) Remove parenthesis around (4 + x) 21 + 4x = 4 + x Solving 21 + 4x = 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. 21 + 4x + -1x = 4 + x + -1x Combine like terms: 4x + -1x = 3x 21 + 3x = 4 + x + -1x Combine like terms: x + -1x = 0 21 + 3x = 4 + 0 21 + 3x = 4 Add '-21' to each side of the equation. 21 + -21 + 3x = 4 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 4 + -21 3x = 4 + -21 Combine like terms: 4 + -21 = -17 3x = -17 Divide each side by '3'. x = -5.666666667 Simplifying x = -5.666666667
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