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Simplifying 12 = 4x + 3(3x + 19) Reorder the terms: 12 = 4x + 3(19 + 3x) 12 = 4x + (19 * 3 + 3x * 3) 12 = 4x + (57 + 9x) Reorder the terms: 12 = 57 + 4x + 9x Combine like terms: 4x + 9x = 13x 12 = 57 + 13x Solving 12 = 57 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. 12 + -13x = 57 + 13x + -13x Combine like terms: 13x + -13x = 0 12 + -13x = 57 + 0 12 + -13x = 57 Add '-12' to each side of the equation. 12 + -12 + -13x = 57 + -12 Combine like terms: 12 + -12 = 0 0 + -13x = 57 + -12 -13x = 57 + -12 Combine like terms: 57 + -12 = 45 -13x = 45 Divide each side by '-13'. x = -3.461538462 Simplifying x = -3.461538462
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