There is none because it's not an equation
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10.8
9x + 2x + 26 is an expression, not an equation (or inequality). It therefore cannot have a solution so that its solution set is the null set. There is nothing in the solution set - no integers, rationals, irrationals: nothing!
Not being an equation, it does not have a "solution" per se. If you wish to factor it, you can do it like so: x2 + 20 - 9x = x2 - 5x - 4x + 20 = x(x - 5) - 4(x - 5) = (x - 4)(x - 5) If that expression is equal to zero, then x would be equal to 4 or 5.
Without an equality sign the given terms can't be considered to be an equation but the terms can be simplified to: 9x-1016
If you mean: 7x-53 = 9x Then the solution is: x = -26.5