12 + 2x = 20
2x = 20 - 12
2x = 8
x = 8 ÷ 2
x = 4
______________
x - 12 = 2x + 36
x - 2x = 36 + 12
-x = 48
x = -48
x - 3 = 2x + 3
x - 2x = 3 + 3
-x = 6
x = -6
-A-
Penjelasan dengan langkah-langkah:
(1. 2x = 20 - 12
x = 8 : 2
(2. x - 12 = 2x + 36 ( 2 ruas dikurangi dengan x)
x - 12 - x = 2x + 36 - x
-12 = x + 36
( 2 ruas dikurangi 36)
-12 - 36 = x + 36 - 36
(3. x - 3 = 2x + 3
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12 + 2x = 20
2x = 20 - 12
2x = 8
x = 8 ÷ 2
x = 4
______________
x - 12 = 2x + 36
x - 2x = 36 + 12
-x = 48
x = -48
______________
x - 3 = 2x + 3
x - 2x = 3 + 3
-x = 6
x = -6
-A-
Penjelasan dengan langkah-langkah:
(1. 2x = 20 - 12
2x = 8
x = 8 : 2
x = 4
(2. x - 12 = 2x + 36 ( 2 ruas dikurangi dengan x)
x - 12 - x = 2x + 36 - x
-12 = x + 36
( 2 ruas dikurangi 36)
-12 - 36 = x + 36 - 36
x = -48
(3. x - 3 = 2x + 3
x - 2x = 3 + 3
-x = 6
x = -6