I have to solve the equation to find x and check my answer each time.
equation 7(10-x)-(4-x)=48
my answer/calculations
7(10-x)-(4-x)=48
(70-7x)-(4+x)=48
70-4-7x+x=48
66-6x=48
-6x+66-66=48-66
6x=-18
6x= -18/-6 = 3
x=3
but then if I check it
7(10-3)-(4-3)=48
(70-30)-(4-3)=48
(40)-(1)=48
40-1=39
why does it equal as a minus? is there something I've done wrong for it not to equal 48