1) Б
-8.7 + x = 2.5
x = 2.5 + 8.7
x = 11.2
2) А
4x - 6 = 2 +5x
4x - 5x = 2 + 6
3) В
40.6 + (-47.8) = -7.2
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Answers & Comments
1) Б
-8.7 + x = 2.5
x = 2.5 + 8.7
x = 11.2
2) А
4x - 6 = 2 +5x
4x - 5x = 2 + 6
3) В
40.6 + (-47.8) = -7.2