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Simplifying 86 + -4x = 9x + 21 Reorder the terms: 86 + -4x = 21 + 9x Solving 86 + -4x = 21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 86 + -4x + -9x = 21 + 9x + -9x Combine like terms: -4x + -9x = -13x 86 + -13x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 86 + -13x = 21 + 0 86 + -13x = 21 Add '-86' to each side of the equation. 86 + -86 + -13x = 21 + -86 Combine like terms: 86 + -86 = 0 0 + -13x = 21 + -86 -13x = 21 + -86 Combine like terms: 21 + -86 = -65 -13x = -65 Divide each side by '-13'. x = 5 Simplifying x = 5
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