100+2x+3x+x/2-56=66
<=> 2x+3x+x/2=66+56-100
<=> 5x+x/2= 22
<=> 5x+0,5x=22
<=>5,5x=22
<=>x= 4
\(100+2x+\frac{3x+x}{2}-56=66\)
\(\Leftrightarrow\frac{200}{2}+\frac{4x}{2}+\frac{3x+x}{2}-\frac{112}{2}=\frac{132}{2}\)
\(\Leftrightarrow200+4x+3x+x-112=132\)
\(\Leftrightarrow88+8x=132\Leftrightarrow x=\frac{11}{2}\)