(х-4)/4-(х+3)/7=0
28*((х-4)/4-(х+3)/7)=0
7(х-4)-4(х+3)=0
7х-28-4х-12=0
3х-40=0
х=40/3=13 1/3
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(х-4)/4-(х+3)/7=0
28*((х-4)/4-(х+3)/7)=0
7(х-4)-4(х+3)=0
7х-28-4х-12=0
3х-40=0
х=40/3=13 1/3