4x + 6x + 7 = 3x + 21
10x - 3x = 21 - 7
7x = 14
x = ¹⁴/7
x = 2
Comprobación
4 (2) + 6 (2) + 7 = 3 (2) + 21
8 + 12 + 7 = 6 + 21
27 = 27
20x + 7 - 3 = 15x + 19
20x - 15x 4= 19
5x = 19 - 4
5x = 15
x= ¹⁵/5
x= 3
20 (3) + 7 - 3 = 15 (3) + 19
60 + 7 - 3 = 45 + 19
64 = 64
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Verified answer
4x + 6x + 7 = 3x + 21
10x - 3x = 21 - 7
7x = 14
x = ¹⁴/7
x = 2
Comprobación
4x + 6x + 7 = 3x + 21
4 (2) + 6 (2) + 7 = 3 (2) + 21
8 + 12 + 7 = 6 + 21
27 = 27
20x + 7 - 3 = 15x + 19
20x - 15x 4= 19
5x = 19 - 4
5x = 15
x= ¹⁵/5
x= 3
Comprobación
20x + 7 - 3 = 15x + 19
20 (3) + 7 - 3 = 15 (3) + 19
60 + 7 - 3 = 45 + 19
64 = 64