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ax-ab+3=2x+b
ax-2x=ab+b-3
x(a-2)=b(a+1)-3
x=(b(a+1)-3):(a-2)
b) a +x/b - x = a //*b
a+x-bx=ab
x-bx=ab-a
x(1-b)=a(b-1)
x=(a(b-1):(1-b)
c) a (2 - 3x) = x/a - 4 ///:a
2-3x=x-(4/a)
-3x-x=-(4/a)-2
-4x=-(4/a)-2 ///*-1
4x=(4/a)+2 ///:4
x=(4/a:4/1)+2/4
x=(1/a)+1/2