Penjelasan:
Kurangi
21
2
1
dari kedua ruas
12 x plus 21 equals 6
+
=
6
12 x plus 21 negative 21 equals 6 negative 21
−
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Penjelasan:
Kurangi
21
2
1
dari kedua ruas
12 x plus 21 equals 6
1
2
+
2
1
=
6
12 x plus 21 negative 21 equals 6 negative 21
1
2
+
2
1
−
2
1
=
6
−
2
1