Question

tìm x: x + 78 + x = 198

Answer 1

x+78+x=198

=>2Xx=198-78

=>2Xx=120

=>x=120:2

=>x=60

Answer 2

x + 78 + x = 198

x.x = 198 - 78

2x = 120 

x = 120 : 2

x = 60

Answer 3

x + 78 + x = 198

X x 2 + 78 = 198

X x 2         = 198 - 78

X x 2         = 120

             x  = 120 : 2

             x =  60

Answer 4

x + 78 + x = 198

X x 2 + 78 = 198

X x 2         = 198 - 78

X x 2         = 120

             x  = 120 : 2

             x =  60