book Maths Puzzle Numerical Ability

Can someone tell me if I did this correctly

3(x-5) + 3x = 4x + 5

I get an answer of x = 10

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book Other Question

-4(x-3)=6(x+5) I AM HAVING A HARD TIME WITH A FEW PROBLEMS WITH MY ALGEBRA HOMEWORK.
10-18DIVIDED BY -4+15-(-17)DIVIDED BY 2=18
I DON'T HAVE A DIVISION SIGN ON MY KEY BOARD