x/0.7—0.17—0.2x/0.13=1

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x/0.7—0.17—0.2x/0.13=1x/0.7—0.17—0.2x/0.13=1x/0.7—0.17—0.2x/0.13=1x/0.7—(0.17—0.2x)/0.13=110x/7-(17-

x/0.7—0.17—0.2x/0.13=1
x/0.7—0.17—0.2x/0.13=1

x/0.7—0.17—0.2x/0.13=1
x/0.7—(0.17—0.2x)/0.13=1
10x/7-(17-20x)/13=1
130x-119+140x=91
270x=210
x=7/9