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64+36:(х*3-15)=70
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64+36:(х·3-15)=70
64(3х-15)+36=70(3x-15)
70(3х-15)-64(3х-15)= 36
6(3х-15) = 36
3х-15=6
3х = 21
х = 7
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64+36:(х·3-15)=70
64(3х-15)+36=70(3x-15)
70(3х-15)-64(3х-15)= 36
6(3х-15) = 36
3х-15=6
3х = 21
х = 7