Question

а)7+x(x-1)=x^2-1 б)3(2x-4)=2x-(5x+9)

Answer 1

а). 7+x^2-x=x^2-1, x^2-x-x^2= -1-7, -x= -8, x=(-8)/(-1)=8. б).  6x-12=2x-5x-9, 6x-2x+5x= -9+12, 9x=3, x=3/9=1/3.