\(x\) + 78 x \(x\)+ 25 x \(x\)- \(x\)x 4 = 78,6 + 121,4
\(x\)x 1 + 78 x \(x\)+ 25 x \(x\)- \(x\)x 4 = 200
\(x\)x ( 1 + 78 + 25 - 4 ) = 200
\(x\)x 100 = 200
\(x\)= 200 : 100
\(x\)= 2
X + 78 * X + 25 * X - X * 4 = 78,6 + 121,4
X * ( 1 + 78 + 25 - 4 ) = 200
X * 100 = 200
X = 200 : 100
X = 2
Vậy X = 2