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2^x *( 2^1 - 3* (1/2)^2 = 80
2^x *(2 - 3 * 1/4) = 80
2^x * (2 - 3/4) = 80
2^x * 5/4 = 80 /*4/5
2^x = 64
2^x = 2^6
x=6