you can't solve that unless you know what the variable, expressed by x, is. if you have a whole equation, something like 5x+35=7x+6, then we could figure out what x is and solve your original problem.
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2x + 5x = 35 7x = 35 x = 35/7 x = 5
2x + 5x = 35 7x = 35 divide each side by 7 x = 5
If you mean: 5x+35 then when factored it is 5(x+7)
35
2x plus 5x simplified is 7x.