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Simplifying -19 = 3(x + 3) + -7x Reorder the terms: -19 = 3(3 + x) + -7x -19 = (3 * 3 + x * 3) + -7x -19 = (9 + 3x) + -7x Combine like terms: 3x + -7x = -4x -19 = 9 + -4x Solving -19 = 9 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -19 + 4x = 9 + -4x + 4x Combine like terms: -4x + 4x = 0 -19 + 4x = 9 + 0 -19 + 4x = 9 Add '19' to each side of the equation. -19 + 19 + 4x = 9 + 19 Combine like terms: -19 + 19 = 0 0 + 4x = 9 + 19 4x = 9 + 19 Combine like terms: 9 + 19 = 28 4x = 28 Divide each side by '4'. x = 7 Simplifying x = 7
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