If you mean: 4x-14x+7 then the expression can be simplified to 7-10x
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If you mean: 7x = 49 then the value of x is 7
You are basically looking for an equation with an x and y value where when 4 is set as x, y would equal 7. An equation of this is: 3 + x = y when x = 4, then y = 3 + 4 = 7
well since you don't know what x is, you just assume that x is now x/7 0r x divided by 7.
Do you mean: 19.7-x = 7-2.2 then if so the value x works out as 14.9
It is: x+4+2x-7 = 3x-3 simplified