Răspuns :
2x-5+10-4x=9(renunti la module)
2x-4x-5+10=9
-2x-15=9|+15
-2x=24
x=-12
2x-4x-5+10=9
-2x-15=9|+15
-2x=24
x=-12
1. 2x-5+10-4x=9 2. 2x-5+10-4x=-9
2x+10-4x=9+5 2x+10-4x=-9+5
2x+10-4x=14 2x+10-4x=-4
2x-4x=14-10 2x-4x=-4-10
2x-4x=4 2x-4x=-14
2x=4 2x=-14
x=2 x=-14:2
x=-7 x=(2;-7)
2x+10-4x=9+5 2x+10-4x=-9+5
2x+10-4x=14 2x+10-4x=-4
2x-4x=14-10 2x-4x=-4-10
2x-4x=4 2x-4x=-14
2x=4 2x=-14
x=2 x=-14:2
x=-7 x=(2;-7)