35+x+x+15=100
35+2x+15=100
35+2x=100-15
35+2x=85
2x=85-35
2x=50
x=50:2
x=25
Ответ 25
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35+x+x+15=100
35+2x+15=100
35+2x=100-15
35+2x=85
2x=85-35
2x=50
x=50:2
x=25
Ответ 25