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x=y÷7
y+20=(x+20)2
y+20=2x+40
2x=y-20
x=(y-20)÷2
y÷7=(y-20)÷2/×14 - JEDNA NIEWIADOMA
2y=(y-20)×7
2y=7y-140
-5y=-140/÷(-5)
y=28