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Simplifying 12 = 8x + -4(3x + -7) Reorder the terms: 12 = 8x + -4(-7 + 3x) 12 = 8x + (-7 * -4 + 3x * -4) 12 = 8x + (28 + -12x) Reorder the terms: 12 = 28 + 8x + -12x Combine like terms: 8x + -12x = -4x 12 = 28 + -4x Solving 12 = 28 + -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. 12 + 4x = 28 + -4x + 4x Combine like terms: -4x + 4x = 0 12 + 4x = 28 + 0 12 + 4x = 28 Add '-12' to each side of the equation. 12 + -12 + 4x = 28 + -12 Combine like terms: 12 + -12 = 0 0 + 4x = 28 + -12 4x = 28 + -12 Combine like terms: 28 + -12 = 16 4x = 16 Divide each side by '4'. x = 4 Simplifying x = 4
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