Solve for x_1
x_{1}=1
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0=-\left(x_{1}-1\right)
Multiply both sides of the equation by 2.
0=-x_{1}-\left(-1\right)
To find the opposite of x_{1}-1, find the opposite of each term.
0=-x_{1}+1
The opposite of -1 is 1.
-x_{1}+1=0
Swap sides so that all variable terms are on the left hand side.
-x_{1}=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
x_{1}=1
Multiply both sides by -1.
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