x*(12.25-1+2.75)=1050
x*14=1050
x=1050:14
x=75
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\(x.12,25-x+x.2,75=1050\)
\(\Leftrightarrow x.12,25-x.1+x.2,75=1050\)
\(\Leftrightarrow x\left(12,25-1+2,75\right)=1050\)
\(\Leftrightarrow x14=1050\)
\(\Leftrightarrow x=1050:14=75\)