Solve for x_1
x_{1}=0
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0\times 0\times 4\left(x_{1}+100\right)=x_{1}
Multiply 0 and 0 to get 0.
0\times 4\left(x_{1}+100\right)=x_{1}
Multiply 0 and 0 to get 0.
0\left(x_{1}+100\right)=x_{1}
Multiply 0 and 4 to get 0.
0=x_{1}
Anything times zero gives zero.
x_{1}=0
Swap sides so that all variable terms are on the left hand side.
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