Решите уравнение:
а) 0,4х+3=0.2(3x+1)-r,
б) 3,4-0,6x=2x-(0,4х+1):
в) 0,8-(0,7х+0,36)=7,1;
г) х-0,5=2 (0,3-0,2).
решите пожалуйста срочно!!​
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