(1+x)/0.1-(0.4x-0.5)/0.2=1/2 (1+x)/(1/10)-(0.4x-0.5)/(1/5)=1/2 10(1+x)-5(0.4x-0.5)=1/2 10+10x-2x+2.5=0.5 10+10x-2x+2.5-0.5=0 10+8x+2=0 8x+12=0 2x+3=0 x=-3/2
