Câu 2
\(20-\left(7\left(x-3\right)+4\right)=-\left(7x-37\right)\)
\(-\left(7x-37\right)=2\)
\(37-7x=2\)
\(-7x=-35\)
\(\Rightarrow x=5\)
Câu 1:
\(x\in\left(\infty,-\infty\right)\)
\(1.3x.32=96x\)
\(96x=3^5\)
\(96x=243\)
\(32x=81\)
\(\Rightarrow x=2\frac{17}{32}\)
Câu 3 :
\(\frac{6x-39}{3}.28=28\left(2x-13\right)\)
\(28\left(2x-13\right)=2^2.3.7.67\)
\(56x=5992\)
\(\Rightarrow x=107\)