5+3x = 7x-4
a) 5+3x = 7x-4
a) 5+3x = 7x-4 5+3×0,5 = 7×0,5-4
a) 5+3x = 7x-4 5+3×0,5 = 7×0,5-4 5+1,5 = 3,5-4
a) 5+3x = 7x-4 5+3×0,5 = 7×0,5-4 5+1,5 = 3,5-4 6,5 = -0,5
6,5+0,5=0
7=0
b) 5+3x = 7x-4
+3x = 7x-4 5+3×2,5 = 7×2,5-4
+3x = 7x-4 5+3×2,5 = 7×2,5-4 5+7,5 = 17,5-4
+3x = 7x-4 5+3×2,5 = 7×2,5-4 5+7,5 = 17,5-4 12,5 = 13,5
12,5-13,5 = 0
-1 = 0
c) 5+3x = 7x-4
5+3×2,25 = 7×2,25-4
5+6,25 = 15,75-4
11,25 = 11,75
11,25-11,75 = 0
-0,5 = 0
