(4x+7)(5x-3)-5(2x-9)^2=183

问题描述:

(4x+7)(5x-3)-5(2x-9)^2=183

(4x+7)(5x-3)-5(2x-9)²=183
20x²+23x-21-20x²+180x-405-183=0
203x=609
x=3