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The equation cannot be solved as there are two unknowns. However it can be simplified and the two unknowns (a and b) expressed in terms of the second unknown.
1) Expressing a in terms of b
4a + 2 = 3b - 5
4a = 3b -7 if desired this could be stated as a = (3b - 7)/4
2) Expressing b in terms of a
3b - 5 = 4a + 2
3b = 4a + 7 if desired this could be stated as b = (4a + 7)/3
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