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2x=21
x=10,5
5-10x=-2x
-8x=-5
x=0,625
7x-21=5x
7x-5x=21
2x=21
x=10,5
-----------------
5-10x=-2x
-10x+2x=-5
-8x=-5 | :(-8)
x= 5/8
7x-5x=21
2x=21/:2
x=10,5
5-10x=-2x
-10x+2x=-5
-8x=-5/:(-8)
x=0,625