It's a simple algebraic equation.
If the value of 'a' is needed, it can be derived as follows:
7a + 10 = 2a
Subtract 2a from each side:
5a + 10 = 0
Subtract 10 from each side:
5a = -10
Divide each side by 5:
a = -2
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7a+10=2a 7a+10-2a=0 5a+10=0 5a=-10 a=-2
7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2
Add them together: 2a+5a = 7a
2a
7a-17 = 4a+1 7a-4a = 1+17 3a = 18 a = 6