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3x = 12 - 5 + 2
3x = 9 /:3
x = 3
b) -3x -1 + 5x + 7 = 0
2x = -7 + 1
2x = -6 /:2
x = -3
c) 4x + 7 - x + 2 = 9
3x = 9 - 7 -2
3x = 0 /:3
x = 0 GOTOWE!!!
2x+x=12-5+2
3x=9/ 3
x=3
b)-3x-1+5x+7=0
-3x+5x=-6
2x=-6/ 2
x=-3
c)4x+7-x+2=9
4x-x=9-7-2
3x=0/3
x=0