\(\left(5x-3\right)\left(7x+2\right)-35x\left(x-1\right)=42\)
\(35x^2+10x-21x-6-35x^2+35x=42\)
\(24x-6=42\)
\(24x=42+6\)
\(24x=48\)
\(x=2\)
Có ai trả lời được câu hỏi dưới bài toán không?
\(3\)k
\(\left(5x-3\right)\left(7x+2\right)-35x\left(x-1\right)=42\)
\(35x^2\)\(+10-10x-21x-6-35x^2=42\)
\(24x=42+6=48\)
\(\Rightarrow2\)