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3b+36=5b
36=2b/:2
b=18 =)
3*(b+12)=5b
3b+36=5b
2b=36
b=18
15/3b= 15/3(12 + b)
3b = 3(12 + b)
3b = 36 + b
2b = 36 /÷2
b = 18