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Simplifying 91 = 21 + 10x Solving 91 = 21 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 91 + -10x = 21 + 10x + -10x Combine like terms: 10x + -10x = 0 91 + -10x = 21 + 0 91 + -10x = 21 Add '-91' to each side of the equation. 91 + -91 + -10x = 21 + -91 Combine like terms: 91 + -91 = 0 0 + -10x = 21 + -91 -10x = 21 + -91 Combine like terms: 21 + -91 = -70 -10x = -70 Divide each side by '-10'. x = 7 Simplifying x = 7
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