Explicație pas cu pas:
d) 15+(x+2)=47-21
15+(x+2)=26
x+2=26-15
x+2=11
x=11-2
x=9
e) 2x+37=65
2x=65-37
2x=28
x=28:2
x=14
f) 32+(2x-5)=77
2x-5=77-32
2x-5=45
2x=45+5
2x=50
x=50:2
x=25
d)
15 + ( x + 2 ) + 21 = 47
36 + ( x + 2 ) = 47
x + 2 = 47 - 36
x + 2 = 11
x = 11 - 2
x = 9 ✓✓
e)
2 • x + 37 = 79 - 14
2 • x + 37 = 65
2 • x = 65 - 37
2 • x = 28
x = 28 : 2
x = 14 ✓✓
f)
32 + ( 2 • x - 5 ) = 63 + 14
32 + ( 2 • x - 5 ) = 77
2 • x - 5 = 77 - 32
2 • x - 5 = 45
2 • x = 45 + 5
2 • x = 50
x = 50 : 2
x = 25 ✓✓
