Решите уравнение б) (5/7-2/3у)*21=1 в)2/3х+7/3х=18 г)7/12m+2/3m-1/4=7

Question

Решите уравнение б) (5/7-2/3у)*21=1 в)2/3х+7/3х=18 г)7/12m+2/3m-1/4=7

Answer 1

( 5/7 - 2/3Y ) * 21 = 1 
5/7 - 2/3Y = 1/21 
5/7 - 1/21 = 2/3Y 
15 - 1 = 14Y 
14Y = 14 
Y = 1 
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2/3X + 7/3X = 18 
9/3X = 18 
3X = 18 
X = 6
====================
7/12M + 2/3M - 1/4 = 7 
7/12M + 8/12M = 75/12 
15M = 75 
M = 5

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