[tex]\displaystyle 1)8y-345=455\\8y=455+345\\8y=800\\y=100\\\\2)630:(150-x)=70,x\neq 150\\\\\frac{630}{150-x}=70\\ \\630=70(150-x)\\9=150-x\\x=150-9\\x=141\\\\3)35+(b+165)=658\\35+b+165=658\\200+b=658\\b=658-200\\b=458\\\\4)400(x-5)=10000\\x-5=25\\x=25+5\\x=30[/tex]
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[tex]\displaystyle 1)8y-345=455\\8y=455+345\\8y=800\\y=100\\\\2)630:(150-x)=70,x\neq 150\\\\\frac{630}{150-x}=70\\ \\630=70(150-x)\\9=150-x\\x=150-9\\x=141\\\\3)35+(b+165)=658\\35+b+165=658\\200+b=658\\b=658-200\\b=458\\\\4)400(x-5)=10000\\x-5=25\\x=25+5\\x=30[/tex]