Question

2,9х-1,4х+2,8=10,3
$2.9x - 1.4x + 2.8 = 10.3$
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Answer 1

2,9x-1,4x=1,5x
1,5x+2,8=10,3
1,5x=10,3-2,8
1,5x=7,5
7,5:1,5=5
X=5