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9x²-12x=9x²-4
9x²-9x²-12x=-4
-12x=-4 |:(-12)
x=0,(3)
b)(0,09y-3,6)y=(2-0,3y)²
0,09y²-3,6y=4-0,09y²
0,09y²-0,09y²-3,6y=4
-3,6y=4 |:(-3,6)
y=-1,(1)
c)(2x+4)²=2x(3+x)+2x²+6
4x²+16=6x+2x²+2x²+6
4x2-2x²-2x²-6x=-16+6
-6x=-10 |:(-6)
x=1,(6)