Question 253306
take it step by step
The first thing to do is get rid of the parentheses. How?
multiply out 1/2(8x-18)
1/2 *8x=4x
1/2(-18)=-9
don't forget the minus sign
so now we have 21=4x-9-x
combine terms
21=3x-9
add 9 to both sides
30=3x
10=x