\(a,14-5+x=30\)
\(\Rightarrow9+x=30\Rightarrow x=30-9\)
\(\Rightarrow x=21\)
\(b,45-\left(3+x\right)=14\)
\(\Rightarrow3+x=45-14\)
\(\Rightarrow3+x=31\Rightarrow x=31-3\)
\(\Rightarrow x=28\)
\(c,18+\left(-3+x\right)-\left(44-x\right)=55\)
\(\Rightarrow18-3+x-44+x=55\)
\(\Rightarrow2x-29=55\Rightarrow2x=55+29\)
\(\Rightarrow2x=84\Rightarrow x=84:2\)
\(\Rightarrow x=42\)
\(d,\left(x-45\right).27=0\)
\(\Rightarrow x-45=0\Rightarrow x=45\)
\(a,14-5+x=30\)
\(\Rightarrow9+x=30\)
\(\Rightarrow x=30-9=21\)
\(b,45-\left(3+x\right)=14\)
\(\Rightarrow3+x=45-14=31\)
\(\Rightarrow x=31-3=28\)
\(c,18+\left(-3+x\right)-\left(44-x\right)=55\)
\(\Rightarrow18-3+x-44+x=55\)
\(\Rightarrow2x-29=55\)
\(\Rightarrow2x=55+29=84\)
\(\Rightarrow x=84:2=42\)
a) (14 - 5 ) + x = 30
9 + x = 30
x = 30 -9
x= 21
\(e,25.\left(42-x\right)=23\)
\(\Rightarrow42-x=23:25\Rightarrow42-x=\frac{23}{25}\)
\(\Rightarrow x=42-\frac{23}{25}\Rightarrow x=\frac{1027}{25}\)
\(g,156-\left(x+61\right)=82\)
\(\Rightarrow x+61=156-82\)
\(\Rightarrow x+61=74\Rightarrow x=13\)
\(h,70-5\left(x-3\right)=45\)
\(\Rightarrow5\left(x-3\right)=25\)
\(\Rightarrow x-3=5\Rightarrow x=8\)
\(i,\left|x+2\right|=-\left(-8\right)+\left|-7\right|\)
\(\Rightarrow\left|x+2\right|=8+7\Rightarrow\left|x+2\right|=15\)
\(\Rightarrow x+2=\pm15\Rightarrow x=-17;13\)
\(k,\left(x-2\right)^2=30-2.7\)
\(\Rightarrow\left(x-2\right)^2=16\)
\(\Rightarrow\left(x-2\right)^2=\left(\pm4\right)^2\)
\(\Rightarrow x-2=\pm4\Rightarrow x=-2;6\)
