2x+45-78=4x+6x-0

For this first one, the first thing you have to do is get the variables on one side and the numbers on the other. So let's subtract 2x from each side.

45-78 = 4x + 6x - 2x

-33 = 8x

x = -33/8

67-77x=0

This one is easier because we don't even have to do any kind of addition or subtraction. We just subtract 67 from both sides.

-77x = -67

Then divide both sides by -77

x = 67/77

87+99-2y+y=56y

This one is done just the same as the first one. Try it yourself. The answer you should come up with is

y = 186/57

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