3f÷2+21=27
3t+8.4=5t
$x^{2}$-6x+3
18=a÷3-12
3(2c+7)=4c+39
3𝑥∙ $\2{\4+2∙6}$ −3 𝑥−2 =0
y=3Lnx, la inversa
22-8x=2x+9
y=3Lnx