х*(30+90)=1200
х*120=1200
х=1200:120
х=10
Ответ:
X*( 30+90)=1200
30x+90x=1200
120x=1200
X=1200:120
X=10
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х*(30+90)=1200
х*120=1200
х=1200:120
х=10
Ответ:
X*( 30+90)=1200
30x+90x=1200
120x=1200
X=1200:120
X=10