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(4a-3)(a+3) = 4a kuadrat +4a-9
2a kuadra -12a-9=4a kuadrat +4a-9
4a^2-6a-6a+9=4a^2+9a-9
4a^2-12a+9=4a^2+9a-9
4a^2-12a+9-4a^2-9a+9=0
4a^2-4a^2-12a-9a+9+9=0
-21a +18=0
-21a=0-18
-21a=-18
a=18/21