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1.Cât face (x-1)(x+2)?
7x-5=5x+19?
2(x-1)+5= 2x+3?
y supra 2 -3=y supra 3+1 supra 2?
3(y+4)-(-3+y)•(-2)=3?
x supra 2-x supra 3=5?
3x-13=87-7x
Vreau demonstratie