\(a,136-4^2:x=134\\ \Rightarrow16:x=2\\ \Rightarrow x=8\\ b,x.\left(-6\right)=\left(-14\right)+44\\ \Rightarrow x.\left(-6\right)=30\\ \Rightarrow x=-5\\ c,257-\left(x^2-1\right)=177\\ \Rightarrow x^2-1=80\\ \Rightarrow x^2=81\\ \Rightarrow x=\pm9\)
a)\(136-4^2:x=134\)
<=>\(16:x=136-134\)
<=>\(16:x=2\)
<=>\(x=16:2=8\)
b)\(x.\left(-6\right)=\left(-14\right)+44\)
<=>\(-6.x=30\)
<=>\(x=-30:6=-5\)
c)\(257-\left(x^2-1\right)=177\)
<=>\(x^2-1=257-177\)
<=>\(x^2-1=80\)
<=>\(x^2=81\)
<=>\(x=\pm9\)