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Examples of the first volume of seventh grade mathematics
It is known that 4x2n-5+5=0 is a linear equation about x, then n=0.

If x=- 1 is the solution of equation 2x-3a=7, then a=-3.

When x=0, algebraic expression

X- 1 and

The value of is reciprocal.

Known x

The sum of the third degree with x is 6 times smaller than the second degree with x, and the listed equation is X.

+3x+6=2x