If the question is:
-5(x-2)=20-5x+10, then it’s a false equation that is never true because:
-5x+10=20-5x+10, which is 0=20, because the other terms cancel out, which is false.
If the question is:
-5x(x-2)=20-5x+10,
-5x(x-2)=30-5x,
divide through by 5:
-x(x-2)=6-x,
-x²+2x=6-x, which is the quadratic:
x²-3x+6=0, which only has complex solutions.