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Simplifying X + -1(-3x) = 7 + x Remove parenthesis around (-3x) X + -1 * -3x = 7 + x Multiply -1 * -3 X + 3x = 7 + x Solving X + 3x = 7 + x Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3x' to each side of the equation. X + 3x + -3x = 7 + x + -3x Combine like terms: 3x + -3x = 0 X + 0 = 7 + x + -3x X = 7 + x + -3x Combine like terms: x + -3x = -2x X = 7 + -2x Simplifying X = 7 + -2x
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