x²-x-12
-1-6x=9-2x
50+(9-5)2-5
2/3 + 3/4
log5 10 + log5 0.5 =
-7x+40=-2x+5
log5 10 + log5 1/2 =
0.2 divide 611
60.000-39.894
20 divide 611
