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x = 9
b) 4x - 5x = 3 + 4
-x = 7 /÷(-1)
x = -7
c) x= 12-3
x= 9
x = 2x + 8 + 1 | -2x
-x = 9 | :(-1)
x = -9
b) 4x - 4 = 5x +3 | + 4
4x = 5x + 3 + 4 | - 5x
-x = 7 | :(-1)
x = -7
c) x +3 = 12 | - 3
x = 9