(1)相等时4x+3=-5x+64x+3+5x-6=09x-3=09x=3x=1/3(2)互为相反数时4x+3=-(-5x+6)4x+3-5x+6=0-x+9=0x=9
(1)4x+3=-5x+6(2)4×+3=-(-5×+6)
1/3 9
①令4x十3=一5x十6,则x=1/3②令4x十3一5x十6=0则x=9
(1)4x+3=-5x+69x=9x=1(2)4x+3=-(-5x+6)4x+3=-5x-69x=-3x=-1/3