Question

Rezolva in multimea Z ecuatiile
17+x=1
x+39=0
-13+x=-1
-x+2+3x=2
x-43=11
12-x=5
6+5x=2x+18
-4-3x=x+8

Answer 1

$17 + x = 1 \\ x = 1- 17 \\ x = - 16 \\ \\ x + 39 = 0 \\ x = - 39$

$- 13 + x = - 1 \\ x = - 1 + 13 \\ x = 12 \\ \\ - x + 2 + 3x = 2 \\ - x + 3x = 2 - 2 \\ 2x = 0 \\ x= 0 \div 2 \\ x = 0$

$x - 43 = 11 \\ x = 11 + 43 \\ x = 54$

$12 - x = 5 \\ - x = 5 - 12 \\ - x = - 7 \\ x = 7$

$6 + 5x = 2x + 18 \\5x - 2x = 18 - 6 \\ 3x = 12 \\ x = 12 \div 3 \\ x = 4$

$- 4 - 3x = x + 8 \\ - 3x - x = 8 + 4 \\ - 4x = 12 \\ - x = 12 \div 4 \\ - x = 3 \\ x = - 3$