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4(1 - x) + 2x = -3(x + 1)
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<span><span>simplify (remove brackets)
</span>4 - 4x + 2x = -3x - 3
combine like terms (e.g -4x + 2x = -2x)
4 - 2x = -3x - 3
put constants and variables on separate sides of the equation
-2x + 3x = -3 - 4
simplify and get your answer!
x = -7</span>
−y+5x−12=0
Add 12 to both sides.
5x−y−12+12=0+12
5x−y=12
Add y to both sides.
5x−y+y=12+y
5x=y+12
Divide both sides by 5.
5x/5=y+12/5
X=1/5y+12/5
The answer would be [4, infinity)
None of them have a solution of x, but 5x=15, 7x-2=19, and 5x+6=21 all have the same answer of x=3
