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2014-07-18T21:49:09-03:00
20x-30 = 40+30-20
20x-30=50
20x=50+30
20x=80
x=80/20
x=4
2 5 2
2014-07-18T21:51:03-03:00
20x - 30 = 40 + 30 - 20
20x = 40 + 30 - 20 +30
20x= 80
x=80/20
x=4
1 5 1