3x(2x+5y-6) = 6x²+15xy-18x-2a(a-4b+1) = -2a²+8ab-2a4x(x-2)-3(x²+5x-4) = 4x²-8-3x²-15x+12 = x²-15x+4
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-2a(a-4b+1)=2a[kwadrat]+8ab-2a
4x(x-2)-3(x[kwadrat+5x-4)=4x[kwadrat]-8x-3x[kwadrat]-15x+12
3x(2x+5y-6) = 6x²+15xy-18x
-2a(a-4b+1) = -2a²+8ab-2a
4x(x-2)-3(x²+5x-4) = 4x²-8-3x²-15x+12 = x²-15x+4