87 : (4x + 5) = 3
4x + 5 = 87 : 3
4x + 5 = 29
4x = 29 - 5
4x = 24
x = 24 : 4
x = 6
__________
9 * (6x - 13) = 153
6x - 13 = 153 : 9
6x - 13 = 17
6x = 17 + 13
6x = 30
x = 5
_________
(46x - 57) : 3 =27
46x - 57 = 27 * 3
46x - 57 = 81
46x = 81 + 57
46x = 138
x = 138 : 46
x = 3
___________
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