219-7.(x+1)=100
=> 7.(x+1)=219-100
=> 7.(x+1)=119
=> x+1=119:7
=> x+1=17
=> x=17-1
=> x=16
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219-7.(x+1)=100
=>7.(x+1)=219-100=119
=>x+1=119:7
=>x+1=17
=>x=17-1=>x=16
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\(219-7.\left(x+1\right)=100\)
\(\Rightarrow\)\(7.\left(x+1\right)=219-100\)
\(\Rightarrow\)\(7.\left(x+1\right)=119\)
\(\Rightarrow\)\(\left(x+1\right)=119\div7\)
\(\Rightarrow\)\(x+1=17\)
\(\Rightarrow\)\(x=17-1\)
\(\Rightarrow\)\(x=16\)