(3.5+5.7)x+(3.5+5.7)+(3.5+5.7)=0
9.2x + 9.2 +9.2 = 0
9.2x +9.1 x 1 + 9.2 x 1 = 0
9.2( x + 1 + 1 ) = 0
9.2(x+2)=0
x + 2 = 0 : 9.2
x + 2 = 0
x = 0 - 2
x = -2
\(\left(3.5+5.7\right)x+\left(3.5+5.7\right)+\left(3.5+5.7\right)=0\)
\(\left(3.5+5.7\right)^3.x=0\)
\(125000.x=0\)
\(\Leftrightarrow x=0\)