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2 2 3 6
3x - 15 - 15 = 4x + 2 - 7
6 6
3x - 20 = 4x - 5
4x - 3x = -5 + 20
x = 15
c) a + (a + 3) + (a + 5) = 51
3a + 8 = 51
3a = 43
a = 43/8
d) 3x² - 2x = 5x² + 4x
5x² - 3x² + 4x + 2x = 0
2x² + 6x = 0
2x( x + 3) = 0
2x = 0 atau x+ 3 = 0
x = 0 x = - 3