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aflati-l pe x: 100(2x+1)+50(3x-1)=400

Răspuns :

100(2x+1)+50(3x-1)=400
200x+100+150x-50=400
200x+100+150x=450
350x=350
x=1
100(2x+1) + 50(3x-1) = 400
200x + 100 + 150x - 50 = 400
200x + 150x = 400 - 100 + 50
350x = 350
x = 1
.................................
q.e.d.