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2x=3-12
2x=-9/:2
x=-4,5
2x=-10/:2
x=-5
13+2x=3 |-13
x=?
2x=-10
x=?
x≠-5 bo [2*(-5)=10] a nie -10
2x=-10|:2
x=-
5
[2*(-5)=10] to sie tyle równa