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Simplifying 7x + -1(3x + 13) = 19 Reorder the terms: 7x + -1(13 + 3x) = 19 7x + (13 * -1 + 3x * -1) = 19 7x + (-13 + -3x) = 19 Reorder the terms: -13 + 7x + -3x = 19 Combine like terms: 7x + -3x = 4x -13 + 4x = 19 Solving -13 + 4x = 19 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 4x = 19 + 13 Combine like terms: -13 + 13 = 0 0 + 4x = 19 + 13 4x = 19 + 13 Combine like terms: 19 + 13 = 32 4x = 32 Divide each side by '4'. x = 8 Simplifying x = 8
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