If you mean: 4x-6+5x = 13x-8 then it works out that x = 1/2 or 0.5
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-5x+50 = 25 -5x = 25-50 -5x = -25 x = 5
There's nothing to solve, it's simply an expression.
It is: 8-2x
If you mean: 3+5x+7 = 70 then the value of x is 12
5x + 2 = 22 5x = 22 - 2 5x = 20 5x/5 = 20/5 x=4