if i think of it,
a=4b
though a =20
so 20=4b
4 x 5=20
so b would equal five
4B/4=20/40
B=5
4(5)=20
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-4b+2 = 18 -4b = 18-2 -4b = 16 b = -4
9b-13b= -4b -4b = 40 Divide both sides by -4 b = -10
4b-b
5b = 8 therefore b = 8/5 therefore b = 1.6
6 + 12 - 5 = 13