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1 - 5x + 7x is an expression, not an equation (no equals sign), so you cannot solve for x. You can, however simplify (combine like terms) and get 1 + 2x.
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.
This can be written as 5x=49+2(-x). To solve this,simplify and solve. 5x=49-2x 7x=49 x=7
65 = 2x - 7x 65 = -5x 65/-5 = -5x/-5 -13 = x
If you mean: 7x-3+5x+15 = 180 then the value of x works out as 14