If: 5x = 4x+7
Then: 5x-4x = 7
And: x = 7
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4x - 3 - 5x + 7 = 6 4x - 5x = 3 - 7 + 6 -1x = 2 x = -2
4x-7=5x-2 x=-5
5x-4x+3=7just adding steps5x-4x+3=7you put numbers to getter but change sign5x-4x=7-35x-4x=4then it is clear5(4)-4(4)=720-16=7so as he said x=4
x=-3
4x-y+7=0