Solve for x in terms of a and b
2a + 3(x-2) = ax + b
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3
^^( that's 2a over 3)
I know it's probably simple but I can't get it!
You're dealing with 'literals' here. This means your answer will not be a number. Both a and b are unknown variables at this time, so we just solve for whichever variable is required. It's like converting formulas like this:
Distance = rate X time
Rate = distance divided by time
Time = distance divided by rate.