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4a + 12 = 8a
12 = 8a - 4a
12 = 4a
12 : 4 = a
3 = a
2x+16+2x-4=8x
4x+12=8x
-4x=-12 /:(-4)
x=3
4a+12=8a
12=8a-4a
12=4a
12/4=a
a=3