September 2018 1 22 Report

Jak się liczy takie zadania proszę o dkładne wytłumaczenie.

12x+7=9x+10 /-9x

12x+7-9x=9x+10-9x

3x+7=10 /-7

3x+7-7=10-7

3x=3 /:3

3x:3=3:3

x=1


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