(2a-1) spure -(2a + 7 )spure equal to 12
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(2a-1)^2 - (2a+7)^2 = 12
( 4a^2 - 2.2a.1 + 1) - (4a^2+2.2a.7+ 49) = 12
4a^2- 4a + 1 - 4a^2-28a- 49 = 12
- 4a-28a - 49 + 1 = 12
- 32a - 48 = 12
-32a = 12+48
-32a = 60
a = - 60/32
a = -15/8
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