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4x+10-15+3x=4x+12+4x+2
4x+3x-4x-4x=12+2-10+15
-x=9 |:(-1)
x=-9
-3x-6+4x-6=-21+7x+5-10x
-3x+4x-7x+10x=-21+5+6+6
4x=-5 |:4
x=1,25