1) 2x +6x=2,4 > 8x=2.4 > x=0.3
2) 12x + 15x =8,1 > 27x=8.1 > x+0.3
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Answers & Comments
1) 2x +6x=2,4 > 8x=2.4 > x=0.3
2) 12x + 15x =8,1 > 27x=8.1 > x+0.3