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10x - 5x + 5x = 10x
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10x
-10x + 5x = -5x
5x+5x-10 10x-10 is the only answer you can get from this
5x +12 = -78 -10x +10x +10x 15x +12 = -78 -12 -12 15x = -66 /15 /15 x = 4.4
10x * 5x = 50x2 =====
x=-3