-0.2(2*1)+4.2(0.5x-8x)-(t+2n-7)-(-2t-5n+8)=(-0.4)-0.2+2.1x-33.6-t-2n+7+2t+5n-8=3n-35.2+2.1x+t
-0.4x-0.2+2.1x-33.6x-t-2n+7+2t+5n-8=-31.9x-1.2+3n+t
-0.2(2*1)+4.2(0.5x-8x)-(t+2n-7)-(-2t-5n+8)=(-0.4)-0.2+2.1x-33.6-t-2n+7+2t+5n-8=3n-35.2+2.1x+t
-0.4x-0.2+2.1x-33.6x-t-2n+7+2t+5n-8=-31.9x-1.2+3n+t