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Simplifying 12 + -3(5 + 4x) = 7x + 20 12 + (5 * -3 + 4x * -3) = 7x + 20 12 + (-15 + -12x) = 7x + 20 Combine like terms: 12 + -15 = -3 -3 + -12x = 7x + 20 Reorder the terms: -3 + -12x = 20 + 7x Solving -3 + -12x = 20 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -3 + -12x + -7x = 20 + 7x + -7x Combine like terms: -12x + -7x = -19x -3 + -19x = 20 + 7x + -7x Combine like terms: 7x + -7x = 0 -3 + -19x = 20 + 0 -3 + -19x = 20 Add '3' to each side of the equation. -3 + 3 + -19x = 20 + 3 Combine like terms: -3 + 3 = 0 0 + -19x = 20 + 3 -19x = 20 + 3 Combine like terms: 20 + 3 = 23 -19x = 23 Divide each side by '-19'. x = -1.210526316 Simplifying x = -1.210526316
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