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2x-30-5x = 20x+10
-23x = 40 /(-23)
x= -0,575
______
5
2x-30-x=4x+2 /*5
_____
5
2x-30-5x=20x+10
30-10=20x+5x-2x
20=23x/ :23
20
__=x
23