2y - 4y = 148
2y = 148
y = 148/2
y = 74
5x + 2x = -25
7x = -25
x = -25/7
x = -3,57
o si no te convence tal ves
x = 3,57
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2y - 4y = 148
2y = 148
y = 148/2
y = 74
5x + 2x = -25
7x = -25
x = -25/7
x = -3,57
o si no te convence tal ves
x = 3,57