a) 5 - 2x + 4x = 21
b) 2 (x - 8) = 20
c) 3x + 8 = x
d) 3(x - 8) = 2x - 4
e) 5x = 180 - 5x
f) 3x - 2 = 14 - 5x
g) 5x - 2 = 3x+2
h) 8(x + 2) = 5(x + 2) + 15



Пожалуйста, подробное объяснение. Все никак не пойму как эти уравнения решать. ​
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