Question

1. Rezolvati in Z ecuatiile :
a) 2x + 1 = -3
b) -2x + 13 = 3x - 2

Answer 1

a).2x+1= -3 
2x= -3-1
2x= -4 
x=-4:2
x= -2
S={-2}

b).-2x+13=3x-2 
13+2=3x+2x
15=5x
x=15:5
x=3
S={3}