4 Which value of x makes the equation 0.25(x+40) = 3+0.75(x - 4) true?
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You made a mistake in your second line.
You put
in brackets, dividing the 
by 3, but you didn't divide the 18x by 3.
So you ended up with 3 times 18x in the end.
You should divide the 18x by 3 too, so you end up with
You put
So you ended up with 3 times 18x in the end.
You should divide the 18x by 3 too, so you end up with