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-x + 3x = -7 -5
2x= -12
x= -6
spr. -(-6) +5 = -(-18) - 7
6+5 = 18 - 7
11=11
-x+3x=-7-5
2x=-12 /:2
x=-6
spr.
-(-6)+5=(-3)x(-6)-7
6+5=18-7
11=11