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Simplifying 7x + 4x = 3x + -12(20) Combine like terms: 7x + 4x = 11x 11x = 3x + -12(20) Multiply -12 * 20 11x = 3x + -240 Reorder the terms: 11x = -240 + 3x Solving 11x = -240 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 11x + -3x = -240 + 3x + -3x Combine like terms: 11x + -3x = 8x 8x = -240 + 3x + -3x Combine like terms: 3x + -3x = 0 8x = -240 + 0 8x = -240 Divide each side by '8'. x = -30 Simplifying x = -30
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