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Simplifying -3(x + -7) = 3x Reorder the terms: -3(-7 + x) = 3x (-7 * -3 + x * -3) = 3x (21 + -3x) = 3x Solving 21 + -3x = 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. 21 + -3x + -3x = 3x + -3x Combine like terms: -3x + -3x = -6x 21 + -6x = 3x + -3x Combine like terms: 3x + -3x = 0 21 + -6x = 0 Add '-21' to each side of the equation. 21 + -21 + -6x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -6x = 0 + -21 -6x = 0 + -21 Combine like terms: 0 + -21 = -21 -6x = -21 Divide each side by '-6'. x = 3.5 Simplifying x = 3.5
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