\(320:\left(x-1\right)=\left(5^3-5^2\right):4+15\)
\(320:\left(x-1\right)=\left(125-25\right):4+15\)
\(320:\left(x-1\right)=100:4+15\)
\(320:\left(x-1\right)=25+15\)
\(320:\left(x-1\right)=40\)
\(\left(x-1\right)=320:40\)
\(x-1=8\)
\(x=8+1\)
\(x=9\)
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\(\left(2^2+3\right).\left(x-5\right)+14=5^2+124:2^2\)
\(\left(4+3\right).\left(x-5\right)+14=25+124:4\)
\(7.\left(x-5\right)+14=25+31\)
\(7.\left(x-5\right)+14=56\)
\(\left(x-5\right)+14=56:7\)
\(\left(x-5\right)+14=8\)
\(\left(x-5\right)=8-14\)
\(\left(x-5\right)=-6\)
\(x=-6+5\)
\(x=-1\)
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