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Simplifying 5x + -3(x + 4) + -1x = 7 Reorder the terms: 5x + -3(4 + x) + -1x = 7 5x + (4 * -3 + x * -3) + -1x = 7 5x + (-12 + -3x) + -1x = 7 Reorder the terms: -12 + 5x + -3x + -1x = 7 Combine like terms: 5x + -3x = 2x -12 + 2x + -1x = 7 Combine like terms: 2x + -1x = 1x -12 + 1x = 7 Solving -12 + 1x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 1x = 7 + 12 Combine like terms: -12 + 12 = 0 0 + 1x = 7 + 12 1x = 7 + 12 Combine like terms: 7 + 12 = 19 1x = 19 Divide each side by '1'. x = 19 Simplifying x = 19
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