Ответ:
1)
2/3=x+1/7.5
x+1=7.5*2/3=15/3
x+1=5
x=4
2)7x+3/10=3/4
7x=3/4-3/10
7x=30/40-12/40
7x=18/40
x=18/40*1/7
x=18/280
x=9/140
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Ответ:
1)
2/3=x+1/7.5
x+1=7.5*2/3=15/3
x+1=5
x=4
2)7x+3/10=3/4
7x=3/4-3/10
7x=30/40-12/40
7x=18/40
x=18/40*1/7
x=18/280
x=9/140