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Simplifying 99 + -3x = 15x + -21 Reorder the terms: 99 + -3x = -21 + 15x Solving 99 + -3x = -21 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 99 + -3x + -15x = -21 + 15x + -15x Combine like terms: -3x + -15x = -18x 99 + -18x = -21 + 15x + -15x Combine like terms: 15x + -15x = 0 99 + -18x = -21 + 0 99 + -18x = -21 Add '-99' to each side of the equation. 99 + -99 + -18x = -21 + -99 Combine like terms: 99 + -99 = 0 0 + -18x = -21 + -99 -18x = -21 + -99 Combine like terms: -21 + -99 = -120 -18x = -120 Divide each side by '-18'. x = 6.666666667 Simplifying x = 6.666666667
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