0.7(х+3)=14×3.6
0.7х+2.1=50.4
0.7х=50.4-2.1
0.7х=48.3
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Делаем накрест
0.7(х+3)=14×3.6
0.7х+2.1=50.4
0.7х=50.4-2.1
0.7х=48.3
х=69