Question

Bài 6 : tìm x

25(2×-7)+28=23(2×-7)+39

end !

Answer 1

\(25\left(2x-7\right)+28=23\left(2x-7\right)+39\)

\(25\left(2x-7\right)-23\left(2x-7\right)=39-28\)

\(\left(25-23\right).\left(2x-7\right)=11\)

\(2.\left(2x-7\right)=11\)

\(2x-7=11:2\)

\(2x-7=5,5\)

\(\Rightarrow2x=5,5+7\)

\(2x=12,5\)

\(\Rightarrow x=12,5:2\)

\(x=6,25\)