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7x = 21
x = 3
-5x - 4x + 10 = 1
-9x + 10 = 1
-9x = -9
x = 1
2 + x/4 = 5
x/4 = 3
x = 3 x 4
x = 12
b) -5x-4x+10 = 1 -> -9x=-9 -> x = 1
c) 2+x/4 = 5 (dikali 4) -> 8+x = 20 -> x = 12
maaf kalau salah:)