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Simplifying 91 + -3x = 15x + 21 Reorder the terms: 91 + -3x = 21 + 15x Solving 91 + -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. 91 + -3x + -15x = 21 + 15x + -15x Combine like terms: -3x + -15x = -18x 91 + -18x = 21 + 15x + -15x Combine like terms: 15x + -15x = 0 91 + -18x = 21 + 0 91 + -18x = 21 Add '-91' to each side of the equation. 91 + -91 + -18x = 21 + -91 Combine like terms: 91 + -91 = 0 0 + -18x = 21 + -91 -18x = 21 + -91 Combine like terms: 21 + -91 = -70 -18x = -70 Divide each side by '-18'. x = 3.888888889 Simplifying x = 3.888888889
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