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Simplifying (3x + -7) = 9x + -21 Reorder the terms: (-7 + 3x) = 9x + -21 Remove parenthesis around (-7 + 3x) -7 + 3x = 9x + -21 Reorder the terms: -7 + 3x = -21 + 9x Solving -7 + 3x = -21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -7 + 3x + -9x = -21 + 9x + -9x Combine like terms: 3x + -9x = -6x -7 + -6x = -21 + 9x + -9x Combine like terms: 9x + -9x = 0 -7 + -6x = -21 + 0 -7 + -6x = -21 Add '7' to each side of the equation. -7 + 7 + -6x = -21 + 7 Combine like terms: -7 + 7 = 0 0 + -6x = -21 + 7 -6x = -21 + 7 Combine like terms: -21 + 7 = -14 -6x = -14 Divide each side by '-6'. x = 2.333333333 Simplifying x = 2.333333333
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