10/9*3/9
8+9x=53
12a+7x-3a-2x
-12x/5=-4
3(2x-8)=2(4-x)
3f÷2+21=27
3t+8.4=5t
$x^{2}$-6x+3
18=a÷3-12
3(2c+7)=4c+39