It is a linear equation in x.
10x = 7x + 15
3x = 15
x = 5
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3+3x+7x=13 3x+7x=10 10x=10 x=1
7x+3=10x-9(shift +3 & 10x) 7x-10x=-9-3(signs changed) -3x=-12(divide both sides by -3) x=4
10x + 5 which is also equal to 5(2x + 1)
Double first equation: 10x + 2y = 10Subtract second equation: 7x = 7x = 1, y = 0
8y-7x