When questions asks us to solve for something unknown, it usually wants us to express the unknown in terms of other numbers.
Therefore, we can solve this by imagining all the other algebra are a number.
10a + 2b = 12
Shift 10a to the other side, turning it negative.
2b = 12 - 10a
Shift 2 from 2b to the other side, dividing 12 - 10a
b = (12 - 10a) / 2
Therefore the answer should be
Therefore, we can solve this by imagining all the other algebra are a number.
10a + 2b = 12
Shift 10a to the other side, turning it negative.
2b = 12 - 10a
Shift 2 from 2b to the other side, dividing 12 - 10a
b = (12 - 10a) / 2
Therefore the answer should be