(3x+1)kwadrat - 9(x)kwadrat = 6(2x+3)
(3x+1)²-9x²=6(2x+3)
9x²+6x+1-9x²=12x+18
6x+1=12x+18
6x-12x=-1+18
-6x=17/:(-6)
x=-17/6= -2 5/6
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(3x+1)²-9x²=6(2x+3)
9x²+6x+1-9x²=12x+18
6x+1=12x+18
6x-12x=-1+18
-6x=17/:(-6)
x=-17/6= -2 5/6