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2x-x=1-4
x=-3
3x-5 =2x-7
3x-2x=5-7
x=-2
----= ------ /obustronnie pomnożyć razy 15
3 = 5
5(2x-1)= 3(x-4)
10x-5=3x-12
10x-3x=-12+5
7x=-7/7
x=-1
b)3x-5 =2x-7
-----=---- /x20
5 = 4
4(3x-5)= 5(2x-7)
12x-20=10x-35
12x-10x=-35+20
2x=-15
x=-7,5