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Simplifying 3x + -1(-1x) + 1 = 7 Remove parenthesis around (-1x) 3x + -1 * -1x + 1 = 7 Multiply -1 * -1 3x + 1x + 1 = 7 Reorder the terms: 1 + 3x + 1x = 7 Combine like terms: 3x + 1x = 4x 1 + 4x = 7 Solving 1 + 4x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 4x = 7 + -1 Combine like terms: 1 + -1 = 0 0 + 4x = 7 + -1 4x = 7 + -1 Combine like terms: 7 + -1 = 6 4x = 6 Divide each side by '4'. x = 1.5 Simplifying x = 1.5
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