12a+7x-3a-2x
-12x/5=-4
3(2x-8)=2(4-x)
3fĆ·2+21=27
3t+8.4=5t
$x^{2}$-6x+3
18=aĆ·3-12
3(2c+7)=4c+39
3š„ā $\2{\4+2ā6}$ ā3 š„ā2 =0