Ответ:
10+x+2x=58
10+3x=58
3x=58-10
3x=48
x=48÷3
x=16
10+16+(2×16)=58
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Ответ:
10+x+2x=58
10+3x=58
3x=58-10
3x=48
x=48÷3
x=16
10+16+(2×16)=58