.Р3.解:原方程化为,整理得12x=6.解得x=.Р4.Р5.x=5Р6.x=Р7.原方程可化为: 去分母, 得40x+60=5(18-18x)-3(15-30x), 去括号得40x+60=90-90x-45+90x, 移项, 合并得40x=-15, 系数化为1, 得x=Р8.Р9.Р10. Р11.解:, , , .Р12.解:2{3[4(5x-1)-8]-20}-7=1,Р 2{3[20x-12]-20}-7=1, Р 2{60x-56}-7=1, Р 60x-56=4, Р 60x=60, Р x=1;Р13.x=-4Р14.x=1Р15.Р16.解:(1)移项得:5x+1.3x=6.5+0.7,合并同类项得:6.3x=7.2,化系数为1得:x=. Р17.去括号得:3x﹣7x+7=3﹣2x﹣6,移项合并得:﹣3x=﹣10,解得:x=;Р18.Р19.去括号得:2x﹣6﹣3x+1=1,移项合并得:﹣x=6,解得:x=﹣6;Р20.x=-1Р21.解: ,,,. Р22.解:去分母得:2(x﹣1)﹣(3x﹣1)=8,去括号得:2x﹣2﹣3x+1=8,Р移项合并得:﹣x=9,解得:x=﹣9.Р23.Р24.x=16.Р25.解: Р26.x=0.7Р27.去分母得,6(x+2)+3x﹣2(2x﹣1)﹣24=0,Р去括号得,6x+12+3x﹣4x+2﹣24=0,Р移项得,6x+3x﹣4x=24﹣2﹣12,Р合并同类项得,5x=10,Р系数化为1得,x=2.Р28.x=-3;Р29.Р30.Р31.x=.Р32.Р33.Р34.x=5Р35.x=-1.5;Р36.x=;Р37.x=3;Р38.x=-;Р39.x=0.2Р40.x=-Р41.x=-Р42.x=1;Р43.x=-;Р44.-34Р45.-1Р46.Р47.Р48.x=﹣1;Р49.x=﹣14.Р50.x=2.8