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Simplifying 139 + -7x = 9x + 21 Reorder the terms: 139 + -7x = 21 + 9x Solving 139 + -7x = 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. 139 + -7x + -9x = 21 + 9x + -9x Combine like terms: -7x + -9x = -16x 139 + -16x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 139 + -16x = 21 + 0 139 + -16x = 21 Add '-139' to each side of the equation. 139 + -139 + -16x = 21 + -139 Combine like terms: 139 + -139 = 0 0 + -16x = 21 + -139 -16x = 21 + -139 Combine like terms: 21 + -139 = -118 -16x = -118 Divide each side by '-16'. x = 7.375 Simplifying x = 7.375
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