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4x-2x=9+7
2x=16
x= 16/2
x=8
1/2x+3=12
1/2x=12-3
1/2x=9
x=9.2
x=18
4x-2x=9+7
2x=16
x=16/2
x=8
b. 1/2x +3 = 12
1/2x= 12-3
1/2x= 9
x= 9 x 2
x= 18