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= 13a+12a-8b+9b
= 25a+b
3.) (3-17x+35z)+(4x+23y-9)= -13x +23y +35z -6
4.) 42n+35m+7 -50m +20n -9 = 62n - 15m -2
2.) yg bener soalny 14b atau 14j? 45i atau 45j?
5.) 5x + 3 -x +1 = 4x +4
6.) kl adakata dari berarti dibalik, caranya:
(2y+15z) - (4y-8) = 2y + 15z -4y +8 = 15z -2y +8
7.) 5z+3 - (2z-7) = 5z+3 -2z +7 = 3z +10
8.) (x-y) - (6x+4) = x-y -6x -4 = -5x -y -4