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16x²-24x+9-9x²-45x+18x+90=7x²+28x+28-8
-24x+9-45x+18x+90=+28x+28-8
-51x+99=28x+20
79x=79
x=1
b) (2-x)²-(2x+1)(2+x)+(3+x)²=(x-1)(4-x)-x(1-x)+1
4-4x+x²-4x-2-2x²-x+9+6x+x²=4x-4-x²+x-x+x²+1
-9x+11+6x=4x-3
-3x+11=4x-3
7x=14
x=2