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-5+5+x=10+5
x=15
-5+x=10 <przenisisz -5 na drugą stronę >
x = 15
lub
-5+x=10/+5 < do obydwu stron dodajesz 5 >
-5 + 5 + x = 10 + 5
x = 15
-5-10-5=-x
-20=-x
x=20