wyłącz wspólny czynnik przed nawias 5a(x+3b)-6b(-3b-x)+2c(3x+9b)
5ax + 15ab + 18b2 + 6bx + 6cx + 18 bc
5a(x+3b)-6b(-1)(x+3b)+2c*3(x+3b)=(x+3b)(5a+6b+6c)
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5ax + 15ab + 18b2 + 6bx + 6cx + 18 bc
5a(x+3b)-6b(-1)(x+3b)+2c*3(x+3b)=(x+3b)(5a+6b+6c)