Odpowiedź:
7x=2x-20 /-2x
7x-2x=-20
5x=-20 /÷5
x=-4
2x=12-2x /+2x
4x=12 /÷4
x=3
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Odpowiedź:
7x=2x-20 /-2x
7x-2x=-20
5x=-20 /÷5
x=-4
2x=12-2x /+2x
4x=12 /÷4
x=3