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x = 7-3
x = 4
7x+4 = 10 - 3x
7x+3x = 10-4
10x = 7
x = 7/10
2x + 3 = -x
2x+x = -3
3x = -3
x = -3/3
x = -1
45 - x = 4x + 25
45-25 = 4x+x
20 = 5x
20/5 = x
4 = x