yes
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x+7 = 2x 2x = x+7 2x-x = 7 x = 7
Standard. You need a linear equation in two variables for slope-intercept form.
It is an equation and the value of x is 1
Yes.
2x+7=3 is an equation. However, 2x=-4 is equivalent. So is x=-2. And an infinite number of others.