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3A-18=B......(1)
7(A-11)=B
7A-77=B......(2)
3A-18=7A-77
4A=59
{A=59/4}
3x59/4-18=B
177/4-18=B
B=105/4
A=Rp14.750,00
B=Rp21.250,00