Ответ:
300-(3x+43) :20=295
-900x+12900:20=295
-900x=295-12900*20
-900x=-257705
x=-900x:257705
x=286,3389
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Ответ:
300-(3x+43) :20=295
-900x+12900:20=295
-900x=295-12900*20
-900x=-257705
x=-900x:257705
x=286,3389