3. И 19х+4(1-4х)=4+3х И послед.-4(3,5х-4) -(7-2,1х)+5(0,3х-5)...

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Сколько будет? 0,8:х=7/6:9/3.
И 19х+4(1-4х)=4+3х
И послед.-4(3,5х-4) -(7-2,1х)+5(0,3х-5)