a) 124+(118-x)=215
124+118-x=215
242- x=215
x=242-215
x=27
b)96-3(x-5)=57
96-3x+15=57
(96+15)-3x=57
111-3x=57
3x=111-57
3x=54
x=54/3
x=18
c)75*(3x-23)=74*72
3x-8 =76/75
3x-8 =7
3x =7+8
3x =15
x =15/3
x =5
d) [(6x-72)/2-84]*28=5628
(6x-72)/2-84 =5628/28
(6x-72)/2-84 =201
(6x-72)/2 =201+84
(6x-72)/2 =285
6x-72 =285*2
6x-72 =570
6x =570+72
6x =642
x =642/6
x 107
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