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30x+15=10-5x+x
30x+15=10-4x
5=26x
x=5/26
e) 3x-5/2 - 5x-1 /10 =0
15x-25-5x-1=0
10x-26=0
f) x/2 = 2/5 (4-x ) -4
5x=4(4-x)-40
5x=16-4x-40
x= -24