(6)0.5x-0.6=0.7x-1.4+8.6

问题描述:

(6)0.5x-0.6=0.7x-1.4+8.6

0.5x-0.6=0.7x-1.4+8.6
0.7x-0.5x=-0.6+1.4-8.6
0.2x=-7.8
x=-7.8÷0.2
x=-39