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2a-12=28
2a=28+12
2a=40 /:2
a=20
b) 3x-1/5-2x-3/2=x/10 /*10
2(3x-1)-5(2x-3)=x
6x-2-10x+15=x
6x-10x-x=2-15
-5x=-13 /:(-5)
x=2,6
2a - 12 : 4 = 7
2a - 3 = 7
2a = 7 + 3
2a = 10 / : 2
a = 5.