Answer:
Equation: 3x - 4 = 6 - 2x
Solution: x = 2
Explanation:
Look at the key.
Left side of the equal sign:
A grey rectangle means x.
There are 3 grey rectangles on the left side, so that is 3x.
A white square means -1.
There are 4 white squares on the left side, so that means -4.
Altogether, the left side is 3x - 4.
Right side of the equal sign:
A black square means 1.
There are 6 black squares, so that means 6.
A white rectangle means -x.
There are 2 white rectangles, so that means -2x.
Altogether, the right side is 6 - 2x.
Put both sides together, and you have
3x - 4 = 6 - 2x
Solve the equation:
Add 2x to both sides.
5x - 4 = 6
Add 4 to both sides.
5x = 10
Divide both sides by 5.
x = 2
Answer:
Equation: 3x - 4 = 6 - 2x
Solution: x = 2