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There are no equations or inequalities in the question: only expressions and there are no standard forms that are any different from what appears in the question.
The standard form is 7x + 2y - 3 = 0
3x = 2y + 7 The standard form is: 3x - 2y - 7 = 0
-7x - 2y = -3
3x + 2y = 7
3x-2y-7=0
That will depend on where the equality sign is and the plus or minus values of 5x and 10 are of which none have been given.
It is an expression in two variable: it is NOT an equation. There is no standard form for expressions.
In standard form it is 4x - 4y = 6 or 2x - 2y = 3
Standard form is: y = Mx + b so you must solve for y 3x = 2y + 7 3x - 7 = 2y 2y = 3x - 7 y = ( 3 / 2 )x - ( 7 / 2 )
4x+2y = 20 2y = -4x+20 y = -2x+10
5x + (3y-x) + (10-2y) = 5x + 3y - x + 10 -2y = 5x - x + 3y - 2y + 10 = 4x + y +10
4x + 2y = 20 2y = -4x + 20 y = -2x + 10.......but you may also write it as y = 10 - 2x.