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3x + 2y = 470
2y = 470 - 3x /:2
y = 235 - 1 x
2/5 x + 3/5 y = 87 /*5
2x + 3y = 435
2x + 3 * (235 - 1 x) = 435
2x + 705 - 4 x = 435
- 2 x = 435 - 705
- x = - 270 /*(-1)
x = 270
x = 108
y = 235 - 1 x
y = 235 - 162
y = 73