and 
are equal. We also know that they are equal to 
. Therefore, when we set up the equality and substitute (14, 12):![2x+7=180-(12y+1)\\2(14)+7=180-[12(12)+1]\\28+7=180-(144+1)\\35=180-145\\35=35](/tpl/images/0351/9262/d9435.png)
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