If x2-2x + 1 = 0, then 2x2-4x=______ ．

If x2-2x + 1 = 0, then 2x2-4x=______ ．

From x2-2x + 1 = 0, we know that if x2-2x = - 1, then 2x2-4x = 2 (x2-2x) = 2 × (- 1) = - 2

The solution of equation 3x + (X-5) = 2x-13 is

-4

2x-3/4=5/6
.

2X-3/4=5/6
2X=5/6+3/4
2X=19/12
X=19/24

How to solve the equation of 2x + 2x = 30 in Volume I of grade 6

2X + 2x of 3 = 30
8/3x=30
x=30÷8/3
x=45/4
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