Răspuns :
3-7x/10=2x+4/7
3-4/7=2x+7x/10
(21-4)/7=(20x+7x)/10
17/7=27x/10
170=189x
x=170/189
X=0.89
4 3/4 - 7x/10 =2x+2 2/7
se introduc intregii in fractie
4 3/4 = (4×4+3)/4 =19/4
2 2/7 = (2×7+2)/7 =16/7
19/4-7x/10=2x+16/7 se aduc la acelasi numitor care e 4×5×7=140
19×35-7x ×14=2x×140+16×20
665-98x=280x+320
378x=345
x=345/378=115/126=0,9(126984)
se introduc intregii in fractie
4 3/4 = (4×4+3)/4 =19/4
2 2/7 = (2×7+2)/7 =16/7
19/4-7x/10=2x+16/7 se aduc la acelasi numitor care e 4×5×7=140
19×35-7x ×14=2x×140+16×20
665-98x=280x+320
378x=345
x=345/378=115/126=0,9(126984)