a) \(x-68=-1256\)
\(x=-1256+68\)
\(x=-1188\)
b) \(3-\left(x+9\right)=67.\left(-2\right)\)
\(3-\left(x+9\right)=-134\)
\(x+9=3+134\)
\(x+9=137\)
\(x=137-9\)
\(x=128\)
c) \(2x+\left(-68\right)-\left(-3\right)=-2020\)
\(2x-68+3=-2020\)
\(2x-65=-2020\)
\(2x=-2020+65\)
\(2x=-1955\)
\(x=-1955:2\)
\(x=-977,5\)
d) \(x-\left(x-5\right)=0\)
\(x-5=x\)
\(x-x-5=0\)
\(-5=0\) (vô lí)
e) \(x^2-112=34\)
\(x^2=34+112\)
\(x^2=146\)
\(\Rightarrow\left[{}\begin{matrix}x=\sqrt{146}\\x=-\sqrt{146}\end{matrix}\right.\)
g) \(\left(x-6\right)^3=-125\)
\(\left(x-6\right)^3=\left(-5\right)^3\)
\(\Rightarrow x-6=-5\)
\(x=-5+6\)
\(x=1\)
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