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Simplifying 7x + -3(1 + x) = -19 7x + (1 * -3 + x * -3) = -19 7x + (-3 + -3x) = -19 Reorder the terms: -3 + 7x + -3x = -19 Combine like terms: 7x + -3x = 4x -3 + 4x = -19 Solving -3 + 4x = -19 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 4x = -19 + 3 Combine like terms: -3 + 3 = 0 0 + 4x = -19 + 3 4x = -19 + 3 Combine like terms: -19 + 3 = -16 4x = -16 Divide each side by '4'. x = -4 Simplifying x = -4
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