Question

△+○+♥=60△ △+○+♥+♥=70○ △+○+○+♥=90b

Answer 1

△+○+♥=60△ △+○+♥+♥=70○ △+○+○+♥=90♥x+y+z=60x__y+z-59x=0____1

x+y+2z=70y__x-69y+z=0_____2

x+2y+z=90z__x+2y-89z=0__3