Объяснение:
(3а-6b+4)/(6a-3b+4)=7
7(6a-3b+4)=3a-6b+4
42a-21b+28=3a-6b+4
42a-3a-21b+6b=4-28
39a-15b= - 24
39a= - 24+15b
a= - 24/39 +15b/39
3×(-24/39 +15b/39 ) +15b+25=
= - 24/13 +15b/13 +15b+25=
=210b/13+301/13=(210b+301)/13=
=(7(30b+43))/13
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Объяснение:
(3а-6b+4)/(6a-3b+4)=7
7(6a-3b+4)=3a-6b+4
42a-21b+28=3a-6b+4
42a-3a-21b+6b=4-28
39a-15b= - 24
39a= - 24+15b
a= - 24/39 +15b/39
3×(-24/39 +15b/39 ) +15b+25=
= - 24/13 +15b/13 +15b+25=
=210b/13+301/13=(210b+301)/13=
=(7(30b+43))/13