\(a.720:\left(x-17\right)=12\)
\(x-17=60\)
\(x=77\)
\(b.\left(x-28\right):12=8\)
\(x-28=96\)
\(x=124\)
\(c.26+8x=6x+46\)
\(8x-6x=46-26\)
\(2x=20\)
\(x=10\)
\(d.3600:\left[\left(5x+335\right):x\right]=50\)
\(\left(5x+335\right):x=72\)
\(5+335:x=72\)
\(335:x=67\)
\(x=5\)
a) \(720:\left(x-17\right)=12\)
\(\Rightarrow x-17=\dfrac{720}{12}\)
\(\Rightarrow x-17=60\)
\(\Rightarrow x=60+17\)
\(\Rightarrow x=77\)
b) \(\left(x+28\right):12=8\)
\(\Rightarrow x+28=12\cdot8\)
\(\Rightarrow x+28=96\)
\(\Rightarrow x=96-28\)
\(\Rightarrow x=68\)
c) \(26+8x=6x+46\)
\(\Rightarrow8x-6x=46-26\)
\(\Rightarrow2x=20\)
\(\Rightarrow x=\dfrac{20}{2}\)
\(\Rightarrow x=10\)
d) \(3600:\left[\left(5x+335\right):x\right]=50\)
\(\Rightarrow\left(5x+335\right):x=\dfrac{3600}{50}\)
\(\Rightarrow\left(5x+335\right):x=72\)
\(\Rightarrow5x+335=72\cdot x\)
\(\Rightarrow72x-5x=335\)
\(\Rightarrow67x=335\)
\(\Rightarrow x=\dfrac{335}{67}\)
\(\Rightarrow x=5\)
