Question

10x-5x-3x=0

Answer 1

2x=0
x=0

Answer 2

or expressed in another way: (10-3-5)x=0
2 times x=0 then one of these must be zero, we know it can't be two, so it must be x. to check this you may put x=0 into the original equation, which gives 10*0-5*0-3*0=0 since everything multiplied by 0 gives 0