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30 + 2x = 3x
30 = 3x - 2x
30 = x
b. 3a + 15 per 5 = 6
3a + 15 = 6 x 5
3a + 15 = 30
3a = 30 - 15
3a = 15
a = 15 : 3
a = 5
a. 9 (4x - 3) - 6 (x - 4) = 7
(9 × 4x) - (9 × 3) - (6 × x) - (6 × 4) = 7
(36x - 27) - (6x - 24) = 7
30x - 3x = 7
30x = 7 + 3
30x = 10
x = 10 per 30
x = 1 per 3