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Simplifying 6x + -3(3x + -7) = 0 Reorder the terms: 6x + -3(-7 + 3x) = 0 6x + (-7 * -3 + 3x * -3) = 0 6x + (21 + -9x) = 0 Reorder the terms: 21 + 6x + -9x = 0 Combine like terms: 6x + -9x = -3x 21 + -3x = 0 Solving 21 + -3x = 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 + -3x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 0 + -21 -3x = 0 + -21 Combine like terms: 0 + -21 = -21 -3x = -21 Divide each side by '-3'. x = 7 Simplifying x = 7
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