2.25-x+0.9=0.57
2.25-x =0.75-0.9
2.25-x =-0.15
x =2.25--0.15
x =2.4
\(2,25-x+0,9=0,57\)
\(\Rightarrow\)2,25-x=0,57-0,9
\(\Rightarrow2,25-x=-3,33\)
\(\Rightarrow x=2,25-\left(-0,33\right)\)
\(\Rightarrow x=2,25+0,33\)
\(\Rightarrow x=2,58\)
Vây x=2,28