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3x + 4y = 390. 000. | .2 | 6x + 8y =780. 000
>>> y = 30.000
2x + 3 ( 30.000) = 810. 000
= 2x + 90.000 = 810. 000
2x = 810.000 - 90. 000 = 720.000
x = 720.000 / 2
x = 360.000
4x + 5y
4 (360.000) + 5 ( 30.000)
= 1. 440.000 + 150. 0000
= 1. 590.000