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20=a²b => -a²=b-20 => a²=-b+20
48=4ab+2a² => 48=4ab+2a²
48= 4ab+2(-b+20)
48=4ab-2b+40
48= 2a +40
2a = 8/:2
a=4
48=4ab+2a²/:4a
48\4a = b
48\16 = b
b=3
a=4
b=3