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4x + 8 = 28
4x = 28 - 8
4x = 20
x = 20 : 4
x = 5
VERIFICACION
4 * ( x + 2 ) = 28
4 * 5 + 8 = 28
20 + 8 = 28
b) 36 + 59 = ( 20 x + 10 ) : 2
95 = 10 x + 5
95 - 5 = 10 x
90 = 10 x
90 : 10 = x
9 = x
VERIFICACION
36 + 59 = ( 20 x + 10 ) : 2
95 = 20 * 9 + 10 : 2
95 = 180 + 10 : 2
95 = 190 : 2
95 = 95
c) 3 * ( 4 x + 6 ) = 198
12 x + 18 = 198
12 x = 198 - 18
12 x = 180
x = 180 : 12
x = 15
VERIFICACION
3 * ( 4 x + 6 ) = 198
3 * 4 * 15 + 18 = 198
12 * 15 + 18 = 198
180 + 18 = 198