1.b^2-36-3b^2-6b= - 2b^2-6b-36
2.9a^2-4+a^2+64= 10a^2+60
3.3c-c^2-6+2c-25+c^2= 5c-31
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1.b^2-36-3b^2-6b= - 2b^2-6b-36
2.9a^2-4+a^2+64= 10a^2+60
3.3c-c^2-6+2c-25+c^2= 5c-31