Question

[(5×x+178)×15+90]:45=63

Answer 1

[(5×x+178)×15+90]:45=63

(75x+2670+90):45=63

(75x+2760):45=63

75x+2760/45=63

15(5x+184)/45=63

5x+184/3=63

5x+184=189

5x=189-184

5x=5

x=5:5

x=1

Answer 2

[(5×x+178)×15+90]:45=63
(5×x+178)×15+90= 63 x 45
(5×x+178)×15+90=2 835
(5×x+178)×15=2 835 - 90
(5×x+178)×15 = 2 745
5×x+178 = 2 745 : 15
5×x+178 = 183
5×x = 183 - 178
x = 5 : 5
x = 1