1.-
10-30=4x-2x
-20=2x
x=-20/2
x=-10
2.-
4x-2x-x=-15+2
x=-13
3.-
2x-2x-1x=-7 -2
--- --- --- ---
3 5 6 10
20x-12x-5x -21-60
-------------- = --------
30 30
3x -81
---- = ----
x=-81/3
x=-27
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1.-
10-30=4x-2x
-20=2x
x=-20/2
x=-10
2.-
4x-2x-x=-15+2
x=-13
3.-
2x-2x-1x=-7 -2
--- --- --- ---
3 5 6 10
20x-12x-5x -21-60
-------------- = --------
30 30
3x -81
---- = ----
30 30
x=-81/3
x=-27