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Simplifying 21 + -6x = 15 + 3x Solving 21 + -6x = 15 + 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 + -6x + -3x = 15 + 3x + -3x Combine like terms: -6x + -3x = -9x 21 + -9x = 15 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -9x = 15 + 0 21 + -9x = 15 Add '-21' to each side of the equation. 21 + -21 + -9x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = 15 + -21 -9x = 15 + -21 Combine like terms: 15 + -21 = -6 -9x = -6 Divide each side by '-9'. x = 0.6666666667 Simplifying x = 0.6666666667
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