👤

Calculati :
a) 7x + 4 = 6x + 12
b) 9x + 7 x 6 = 3x - 18


Răspuns :

a) 7x=6x+(12-4)=>7x=6x+8=>7x-6x=8=>x=8
b)
9x+7•6=3x-18=>9x+7=3x-(18:6)=>9x+7=3x-3=>9x=3x-(3-7)=>9x=-5=>x=-5:9=-0,(5)