Помогите уравнения решить, пожалуйста. 18) 1,3х+1=х-2
19) 10х-3+5=х+3х
20) 0,18х-3,54=0,19(х+5)
2) -3,2n+4,8=-2(1,2n+2,4n)
3) 0,3(5х-7)=3*(0,2х+3,2)
4) -5 (0,8а-1,2)=-а+7,2
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