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2014-05-31T16:35:05+03:00
4(x+5)-5(x+3)=x-5
4x+20-5x-15=x-5
4x-5x-x+20-15+5=0
-x-x+5+5=0
-2x+10=0
-2x=-10
2x=10
x=5
2014-05-31T16:37:47+03:00
4x+20-5x-15=x-5
-x+5=x-5
2x=10⇒ x=10:2=5 ⇒ x=5
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