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12-\left(1\times 3+2\right)=2\times 3+1
Multiply both sides of the equation by 3.
12-\left(3+2\right)=2\times 3+1
Multiply 1 and 3 to get 3.
12-5=2\times 3+1
Add 3 and 2 to get 5.
7=2\times 3+1
Subtract 5 from 12 to get 7.
7=6+1
Multiply 2 and 3 to get 6.
7=7
Add 6 and 1 to get 7.
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Compare 7 and 7.
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Simultaneous equation
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Limits
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