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Simplifying 3x + -3(4x + -7) = 0 Reorder the terms: 3x + -3(-7 + 4x) = 0 3x + (-7 * -3 + 4x * -3) = 0 3x + (21 + -12x) = 0 Reorder the terms: 21 + 3x + -12x = 0 Combine like terms: 3x + -12x = -9x 21 + -9x = 0 Solving 21 + -9x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -9x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = 0 + -21 -9x = 0 + -21 Combine like terms: 0 + -21 = -21 -9x = -21 Divide each side by '-9'. x = 2.333333333 Simplifying x = 2.333333333
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