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(x+1)(3x+2)=2x-5
3x2+5x+3=2x-5
3x2+5x=2x-5-3
3x2+5x=2x-8
x(3x+5)=2x-8
x=2x-8/3x+5
f(2)=2.2-8/3.2+5
f(2)= -4/11