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4x+3 = 5x+7
4x - 5x = 7-3
- x = 4
x = -4
x +4 = -4+4
= 0
no19)
f(x) = 2x + 3
f(-4) = 2.(-4)+3
= -8+3
= -5
no20)
yg merupakan fungsi yang (i) , (ii) dan (iii)