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mnożymy na krzyż
2x=3(2x+4)
2x=6x+12
2x-6x=12
-4x=12
x=-3 odp.C
2)a1=2, q=1/4
a3=a1*q^3-1=a1*q²=2*(1/4)²=2*1/16=1/8 odp.C