3.1(1-3t)=0.4(t-14) 0.2(x-3)-1=0.5(x+3)-0.4

0.2x-0.6-1=0.5x+1.5-0.4   => 0.2x-1.6=0.5x+1.1  =>  -0.3x=2.7  => x= -9