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4(2x-1,5)-3(2x+1)^2=4(x-1)^2-16x^2
8x-6-3(4x^2+4x+1)=4(x^2-2x+1)-16x^2
8x-6-12x^2-12x-3=4x^2-8x+4-16x^2
-12x^2-4x-9= -12x^2-8x+4 /+12x^2
-4x-9= -8x+4 /+8x+9
4x=13 /:4
x=3,25=3 1/4