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Simplifying 3x + 2(-1x) + x + 7 = x + 3 Remove parenthesis around (-1x) 3x + 2 * -1x + x + 7 = x + 3 Multiply 2 * -1 3x + -2x + x + 7 = x + 3 Reorder the terms: 7 + 3x + -2x + x = x + 3 Combine like terms: 3x + -2x = 1x 7 + 1x + x = x + 3 Combine like terms: 1x + x = 2x 7 + 2x = x + 3 Reorder the terms: 7 + 2x = 3 + x Solving 7 + 2x = 3 + 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. 7 + 2x + -1x = 3 + x + -1x Combine like terms: 2x + -1x = 1x 7 + 1x = 3 + x + -1x Combine like terms: x + -1x = 0 7 + 1x = 3 + 0 7 + 1x = 3 Add '-7' to each side of the equation. 7 + -7 + 1x = 3 + -7 Combine like terms: 7 + -7 = 0 0 + 1x = 3 + -7 1x = 3 + -7 Combine like terms: 3 + -7 = -4 1x = -4 Divide each side by '1'. x = -4 Simplifying x = -4
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