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7x = 30 - 2
7x = 28
x = 28/7
x = 4
VERIFICAMOS :
7x + 2 = 30
7 (4) + 2 = 30
28 + 2 = 30
30 = 30
-----------------------------------------------
2x = 4
2x = 16
x = 16/2
x = 8
VERIFICAMOS :
√2x = 4
√2 (8) = 4
√16 = 4
4 = 4
-----------------------------------------
x/3 + 4 = 10
x/3 = 10 - 4
x/3 = 6
x = 6 * 3
x = 18
VERIFICAMOS :
x/3 + 4 = 10
18/3 + 4 = 10
6 + 4 = 10
10 = 10
----------------------------------------
4 + 2x = 38
2x = 38 - 4
2x = 34
x = 34/2
x = 17
VERIFICAMOS :
4 + 2x = 38
4 + 2 (17) = 38
4 + 34 = 38
38 = 38
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