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Simplifying 3(x + 4) + x = (2x + -7) Reorder the terms: 3(4 + x) + x = (2x + -7) (4 * 3 + x * 3) + x = (2x + -7) (12 + 3x) + x = (2x + -7) Combine like terms: 3x + x = 4x 12 + 4x = (2x + -7) Reorder the terms: 12 + 4x = (-7 + 2x) Remove parenthesis around (-7 + 2x) 12 + 4x = -7 + 2x Solving 12 + 4x = -7 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 12 + 4x + -2x = -7 + 2x + -2x Combine like terms: 4x + -2x = 2x 12 + 2x = -7 + 2x + -2x Combine like terms: 2x + -2x = 0 12 + 2x = -7 + 0 12 + 2x = -7 Add '-12' to each side of the equation. 12 + -12 + 2x = -7 + -12 Combine like terms: 12 + -12 = 0 0 + 2x = -7 + -12 2x = -7 + -12 Combine like terms: -7 + -12 = -19 2x = -19 Divide each side by '2'. x = -9.5 Simplifying x = -9.5
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