15z+87*59=102
15z+5133=102
15z=102-5133
15z= -5031
z= -(5031/15)
z= -335,4
97+4y-286=6
4y=6-97+286
4y = 195
y = 195/4
y = 48,75
15z+87*59=102
15z+5133=102
15z=102-5133
15z= -5031
z= -(5031/15)
z= -335,4
97+4y-286=6
4y=6-97+286
4y = 195
y = 195/4
y = 48,75