4х+3(х+10)=520
4х+3х+30=520
7х=490
х=490:7
х=70
Ответ: х=70
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4х+3(х+10)=520
4х+3х+30=520
7х=490
х=490:7
х=70
Ответ: х=70
4х+3х+30=520
7х=490
х=490:7
х=70
Ответ: х=70
4x+3x+30=520
7x-490
X=490:7
Ответ: 7