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Simplifying 99 + -7x = 11x + 21 Reorder the terms: 99 + -7x = 21 + 11x Solving 99 + -7x = 21 + 11x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11x' to each side of the equation. 99 + -7x + -11x = 21 + 11x + -11x Combine like terms: -7x + -11x = -18x 99 + -18x = 21 + 11x + -11x Combine like terms: 11x + -11x = 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 = -78 -18x = -78 Divide each side by '-18'. x = 4.333333333 Simplifying x = 4.333333333
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