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2a+2-6 = 12 + 5/4a - 5/2
2a-4=9 1/2 + 5/4a
8/4a-5/4a = 9 1/2+4
3/4a = 13 1/2
a= 27/2 x 4/3
a= 18
semoga ini benar :)
2a - 4 = 38/4 + 5/4a
2a - 5/4a = 38/4 + 4
3/4a = 38/4 + 16/4
3/4a = 54/4
a = 54/4 x 4/3
a = 216/12
a=18