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Tears! The first volume of seventh grade mathematics (Zhejiang Education Edition) 5. 1 is a linear equation with one variable! Homework answer!
1 wrong or wrong

2.( 1)x= 1

Solution: When x equals-1

Left =7

Right = 1-3 *( 1)= 4

Because left is not equal to right.

So X=- 1 is not the solution of 1-3 = 7.

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